LSD, Serotonin modulating substances and onset IBS?

I have suffered with IBS-D for nearly six years now, and have tried everything from probiotics, to fasting, supplements. It has ruined my life and mental health and I am suspicious it has everything to do with a traumatic loss of family members and the abuse of LSD, cannabis and other serotonin altering substances.

I am suspicious if anyone else has the same experience. As I see here and all around the web that, ssri’s can almost completely solve them. Making me think I might have brain damage thats induced this and perhaps a psychotic illness. I don’t enjoy life at all, I barely eat 1000 calories a day, I cant sleep, I am disinterested in eating and all of life entirely.

I am wondering if anyone has similar experiences or conclusions because I have lost all hope or respect for medicinal industries and refuse to accept their medicines or “treatment” of it. I can literally only eat meat and if I take opioids I can manage decent stool.

Anyone else notice that its onset was related to terrible experiences or intense drug use? I was also a formula baby and was a c-section baby, horrible diet my entire life. Probiotics helped at first but now are seemingly useless. Running out of options and may apply for disability.