This is what I expected. Others have covered the OP is faking, so i will give the benefit of the doubt and assume OP is veracious and that the description of blue fingers not related to the pictures that just happened to be posted just yesterday.
many of the symptoms you described are consistent with a panic attack. These can frequently mimic symptoms of a heart attack, or cause severe stomach pain. The shortness of breath, racing heart, feeling weird, stomach hurting, etc. You described extreme pain and linked it to overconsumption of alcohol.
Certainly not to put words in your mouth, but most literature or reference books might better describe ethanol toxicity as very distressful or uncomfortable, but not "painful." your description sounds like a feedback loop of actual SN symptoms, greatly magnified by a panic attack. You were in distress from a breakup.
trying to back out how much SN consumed will be difficult, as heaping spoonfuls of what you posted could potentially mean much more than 25g were added to a still indeterminate amount Of liquid. OP could have consumed a gram or a few. I have no idea at the amount of water added, as that has changed. Coffee cups can GREATLY vary in size around the world.
What does this mean for SN in general? It's a data point, one among many. Looking at the failures or even successes google doc, not everyone goes peacefully into the night. Suicide is stressful, period. Certain symptoms can be viewed as extremely distressful (e.g. nausea to someone who suffers from chronic vertigo or the panic some feel at even the thought of an exit bag placed over their head) to some but not as much so for others. Likewise, panic and anxiety from suicide, especially in an individual in crisis, can greatly magnify and distort perceptions.