It's good that you are putting thought into what you are trying to do. It's better to be thoroughly aware. Ironically, half knowledge is lethal, whichever way you want to interpret it. :-)
The lethality of any substance is scientifically quantified by finding out how much of it - per individual subject - is required to kill 50% of the tested sample population. Obviously, they don't test it on humans. They test it usually on rats which no one cares about, except PETA maybe. Based on this extrapolation of rat's death rate, scientists say that even 5 grams of this SN salt is enough to kill an average human of about 65 kg. Suicidal people ingest 20-25 grams which is a lot. So, this is a hypothetical figure because what about the rest of 50% of population, will they also die for sure? What about a man who is not of average body type? Human bodies have a lot of variables within them. But be certain that 20-25 gm is more than enough to kill a person, including Superman and zombies.
Now that its lethality is out of question, we will see how it works. Simply, the salt gets absorbed primarily in the small intestine and goes into blood, this is where the battle starts. It starts reducing the oxygen carrying and delivering capacity of the red blood cells, so other cells all over the body including the brain get deprived of the oxygen which is critical for cellular existence. That's it, if at least 50-70% of RBC are damaged this way and the cells are deprived of oxygen long enough, they die, and the human body is dead. End of life. End of story.
Now what if's.
a) Vomiting - Let's say you try to down 20 gm of this bad tasting white stuff, but you puke out 80% of it, so 4 gm is still in your body, this is potent enough, this alone can kill some brain cells if not all by smothering them. By the time you would realize this you'd have altered mental state and you'd be likely unconscious. It means you are too late to call for help. So, you couldn't ingest enough to kill yourself but enough to reach the level of brain damage or coma.
b) Found out - If you get found out soon enough and the paramedics treat you right away, the condition in the blood can be rapidly reversed, that way the damage to your other cells in body is avoided. But what if you are rescued at a point where enough damage is done to your brain but not enough to kill you?
c) Survival Instinct - This is the hardest one. Even you don't know how it is going to work with you at that state of mind. It can just force you to live mid way. Basically, it may make you stop completing the act or compel you to puke out at that critical point which is enough for brain damage but not enough to CTB.
So above is that important window where you can have brain damage, coma, shock or myocardial infarction or cardiac arrest.
To avoid puking, some suicidal people will take antiemetic drug. Let me tell you why this may or may not always work. First of all, these drugs "try" to ease out symptoms of nausea and vomiting. Like any drug, there is no guarantee. These anti-vomiting drugs don't completely make it impossible for you to vomit. They will not seal your mouth. You'll still be capable of puking. These drugs have various course of action (called pharmacodynamics and pharmacokinetics in technical parlance). This action route depends on purpose or source of symptom, whether it is for motion sickness or post surgery or cancer therapy or pregnancy etc. Each course of action works on different receptors in body. The medical science doesn't understand properly how the neurotransmitters that regulate vomiting work. Hence, these drugs try to suppress but cannot completely stop vomiting with promise. You may think of overdosing on these antiemetics or combining different types of them to be certainly effective. Bad idea. They will increase their own side effect and actually they may reverse their role and make you vomit even more.
As you already know how strongly you puke when you puke, it's involuntary, and the power of survival instinct can double down throwing out as much of SN it can, but the residual amount in your stomach can be enough to hang you in that limbo of brain damage.
Strange things can happen inside human body. Even the medical science does not have answers. Most people believe that you can puke out only what's in the stomach. But there is something called stercoraceous vomiting or copremesis when even the contents of your intestine can find a way out through your mouth by opening the strong pyloric sphincter which is supposed to be one way. Basically, you literally puke feces.
The attempt to kill yourself is the toughest battle you can wage on your body. Millions of years of evolution has strengthened the body's own will power that is separate from our conscious control and it can fight against the mind's desire to kill the body. The body won't give in so easily. Body even knows how to fool itself and the mind, merely to survive.
I have researched deeply on this topic and I've looked up scientific journals that are available in university libraries. I'll paste two screenshots, one from Cornell university and the other from the Journal of Systems and Integrative Neuroscience. They both mention brain damage because of SN. There are more references but buried in the shelves of biochemistry, pharmacology and toxicology books. I can explain all this in a more technical language but what's the point.
I do not intend to interfere with your right to live or your right to die. I intend to share this knowledge hoping you do not end up being far more miserable then you probably are right now. I empathize with you feelings and your reasons to off yourself. This isn't a ride anyone takes to enjoy and I hope for the best for you. A person on a hospital bed in a comatose state can't even tell whether they are pro-lifer or pro-choice. Read up on Terri Schiavo and Aruna Shanbaug who was in vegetative state for 42 years after a brutal rape. Both had cerebral hypoxia. Imagine the horror.
You'll hear many opinions from many people but end of the day what happens with you and your life is your responsibility. This is the least I can do. Whatever you choose, hope it is peaceful and on your terms, not tragic. *hugs*
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