Hi and welcome,
I have all these symptoms. Not sure stomach problems are related to orgasm, in my case.
- For tremors, I recommand to try to add more salt in your food and take 1 cap of magnesium at 16 and another at 19. Mg and Cl works for me.
- I have minor breathing troubles and heartbeat after orgasm. I recommand to avoid sugar, to reduce carbs and chose the best ones, to increase proteins and take 500mg of taurine before orgasm.
- For stomach problems, I'm not sure so I prefer to avoid to answer for now.