I was scared, just like you when I was first recommended Seroquel, but it may work very well for you, as it did for me. It takes getting used to.

I've been on various doses of Seroquel throughout the years. It's an interesting medication in the sense that it acts differently at various doses. It tends to be used for insomnia at lower doses (typically 100 mg or below. It feels like a strong antihistamine). Like others said, side effects are lower in this dose range for most, although severe fatigue is common, but only at first. Most get used to it, although of course not each drug is for everyone.

200-400 mg was sort of like an antidepressant for me, rather than an anti-manic. It might help prevent mania and hypomania in this dose range though, especially for maintenance.

I noticed it having an anti-manic and antipsychotic effect by the time I hit 600 mg, although I get some symptoms. The fatigue was bad for most doses initially, but oddly, higher doses usually means less fatigue once you get used to it. I get mild tremor, but the benefits outweigh the risks. Tremor isn't common at a low dose. I may not be symptom-free, but Seroquel has done me a lot of good.