It sounds like you don't have a great relationship with your doctor--is it possible for you to find someone else to work with? Ideally the relationship should be a partnership between you two.
As for seroquel, I'm a little confused about why you would like to take more if it's causing you problems? Have you tried a lower dose? At a previous point, I tried 25 mg. of Seroquel and stopped after a week because of day-time flat affect. Then I read that it can take a month or so to settle in, and see whether issues like that will go away.
I recently started again, at 12.5 mg. and we have slowly inched up to 75 mg, which seems to be controlling my insomnia and my anxiety without any side effects. Adjusting meds can be a frustratingly slow process, but the more slowly you go, the better the chance you'll end up on the minimum affective dose for you, minimizing side effects.
Why do you want Lithium? It is helpful for a lot of people, but there are also other drugs. Is there something in particular you think it might help you with? Have you explained this to your doctor?