Interesting. The Serotonin Syndrome thing really surprises me. If you really have that kind of sensitivity to serotonin I would probably stay away from tryptamines all together, since most of them bind to serotonin receptor sites.

Phenethylamines seem like they would be a safer choice from a psychopharmacological standpoint, but I understand your cardiovascular concerns as well.

I'm not a doctor so don't take any of what I'm saying as professional advice. It most certainly is not. It seems to me that you may be safer just taking a more natural route to consciousness expansion, such as meditation, isolation tanks, etc. Aside from that, like others mentioned, I would suggest finding a knowledgeable doctor that you can trust before you just go experimenting.

Best of luck my friend. Looks like you have some big decisions to make.

Peace,

-idt