Unfortunately this does sound like PSSD. People have reported developing it from 5HTP. And indeed, its very difficult to get a doctor to even hear you out. The first step is to get a physical examination by a urologist and a hormone panel. You should also start seeing a therapist. If you can say you have tried all of these, other doctors will be more likely to help you. After that, see a psychiatrist. In my experience, the only way to recover from PSSD is with more medication. Wellbutrin and buspirone are both helpful in treating PSSD, and some people benefit from SSRI reinstatement.