neck rigid and muscle twitches??

tldr; my neck muscles sometimes feel rigid and tense and will twitch or cause my shoulders to twitch sometimes. i wanna smoke weed again once in a while but this is giving me serious health anxiety and i don’t wanna mix the two if im gonna be hyper focused on it being a sign of serotonin syndrome or something.

i’ve been on prozac for like 8 weeks now. i was originally taking it in the morning but with my irregular sleep schedule i was taking it hours before or after my regular time sometimes and would occasionally miss a dose entirely, i think it was causing issues for me. i notice the tenseness worsens with anxiety or with caffeine but i went out drinking with some friends the other weekend with nothing but a mild hangover the next day. i wanna go back to smoking weed once a week or so, but with the rigidity and anxiety from it, im almost scared its like some sign of serotonin syndrome or smth. i know people smoke on prozac like all the time, but idk ive been kind of weary about it because ive been on prozac before and never noticed these symptoms. im only on 10mg and ive started taking the meds at night to make it a more regular schedule for my body, and i think thats helped. idk im just feeling anxious about it and was looking for advice, sorry if this sounds silly or like im rambling lol