What will there be other than vomiting?
There will be diarrheas in certain cases (
or just the need to go to the toilet, hence why I recommend not eating much prior to taking caffeine), headaches, sensitivity to light, sound and touch (
imagine you have a bit too much coffee and time it by 50) and sweating (
I don't sweat a lot normally anyway so it wasn't crazy much for me during my OD). Other than that, once caffeine is at its peak, there will be a lot of convulsions and shaking. Those will be uncomfortable but they won't be painful at all (
from my experience).
But what if you don't use protein powder
Then I recommend getting protein powder as you get the caffeine powder online as well. It doesn't need to be a whole tub, just a small pack. That will definitely make it look like you're just preparing yourself to get in shape.
With everything said, I hope you get the happiness and peace you so deserve! Sending you hugs

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This is an awful method. Drowning or lighting yourself on fire is a way better method. This method takes far too long.
Yes, totally, you're not wrong. The reason why I feel like this method might be worth considering is because:
1. It's accessible and affordable
2. There have been several reported cases, in which it's been shown that there would be no long-lasting damages to the body
3. It can be played off as ingesting by mistake instead of being ruled out immediately as a suicide attempt
4. Some people are desperate for a way out that's not suspension