As has already been said, Seroquel is an antipsychotic.
More specifically, it is an Atypical Antipsychotic that has very little effect on dopamine receptors (so there is very little chance of developing movement disorders, even during long-term high-dose treatment). Instead, it effectively blocks serotonin and histamine receptors, resulting in some very intense sedation (atleast early on in the treatment) and mad munchies. Personally, I hated it, but I also met plenty of people who were very happy with it. Indeed, some people not only find the drug to be a useful anxiolytic/sleep aid/mood stabilizer, but they actually feel an increased sense of motivation because of the noradrenergic action of its metabolite, Norquetiapine.
So my advice... give the stuff a chance. And grit your teeth through the first few days of treatment, when the antihistaminergic effects will leave you fucking floored well into the following morning. Like all antipsychotics, it's not something for everyone (it sure wasn't for me), but if it does work for you, then go for it.