I have a very similar terrible reaction to smoking weed. I get incredibly dizzy, uncontrollable muscle spasms, and the "crawling" feeling in my head. Even after just a little bit, I begin to feel incredibly dysfunctional beyond what is normal.
I've always chalked it up to some kind of toxic liver overload, but the main parasite I seem to be dealing with is blastocystis hominis.
Anyone know any details about blasto and weed? Would love some information if anyone knows of any.