I have had my medical marijuana card for almost a year and I have been really sick. Does anyone know about Serotonin syndrome and marijuana? I have lost a lot of weight, and have the following symptoms: severe anxiety, nausea, low potassium, muscle loss, muscle twitches, eye twitches, heat sensations throughout body, sweats, hand & feet cramps. My Meds are: Paxil, cymbalta, seroquel, inderal. I just read something about marijuana increasing serotonin. Maybe I need to have my level checked?