If shrooms make your stomach feel like shit there's a good chance it's because your diet sucks shit or you got really old shrooms. A lot of people have improperly dried shrooms or ones that have just been sitting around too long. I used to eat em fresh or nearly fresh all the time and can say without a doubt they helped me in every conceivable way in life - erased my depression and anxiety, helped me stop drinking alcohol and caffeine, helped me exercise everyday, write, make music, reach out to friends more, and even skated way better at the time.