When I was in the hospital two months ago for mania with psychotic features Seroquel knocked it out of me. It is sedating. However I can't take it for very long because it causes menstral irregularities. I take Invega as an antipsychotic instead. It's supposed to have antimanic properties.
I take Lamictal as a mood stabilizer & it works quite well for me. But it had to be titrated up very slowly.
I'm sorry your child is having problems. I hope everything works out.
Therapy has helped too. It helps me be more aware of my moods.