I tried it once 500mg at night after I got off anti depressants. For me it gave me extreme nausea and anxiety. I was on SSRI's and SNRI's for 13 years. I can not take tryptophan either. Does the same thing just not to the same severity as 5HTP.
I tend to have severe or paradoxical reactions to most things so for you it might be worth giving a try. If you get capsules you can always empty half out of one to start with and go from there.