hi. you're young. younger people are more sensitive to psych drugs in general, especially the tranquilizers. i got intense adverse effects from a similar dose of seroquel when i was your age. its also your 1st major episode, right? 1st episode people/patients tend to do well with lower doses, and they're also more prone to adverse effects.

maybe a different tranquilizer? abilify comes to mind. its generally non-sedating, less weight gain than many other 'atypical' tranquilizers, good tolerability for a lot of people.

lithium is still sometimes used in psychotic depression. i wouldn't be gung-ho about lithium, but it -might- be a viable option, if you don't do well on tranquilizers.

hope this helps.