I don't know if this is relevant in any way, but the second time I was on Seroquel I developed very painful muscle or joint (I didn't know which or both) pain if I was in the same position too long. This happened every night and woke me up at least once. It hurt enough that I would have considered it an emergency, but I could walk it off. It only once happened in the day when we on an hour or two car drive and we had to stop the car and pull over on the side of the highway. My psychiatrist didn't want to prescribe any type of muscle relaxant on top of the drugs I was already taking--and rightly so. We knew it was the Seroquel. I don't know why I put up with it as long as I did; I think because I found the Seroquel to be pretty mellow otherwise. It wasn't dystonia or akathisia and I never ran into a forum post that had the same side effect. When I switched to Latuda it went away but I had akathisia (I had had it before badly on Abilify). I take propranolol (a beta blocker) for that and it works. As I said, this doesn't even sound like what you have. There it is anyway.