Prozac can cause insomnia, as can Lamictal. You need something to balance those out - a mood stabilizer or an antipsychotic. Which ones you hated and did you take them along an antidepressant?

At this point I would, as you yourself suggested, taper down on Prozac. Between Lamictal and Prozac, Prozac is stimulating to more people than is Lamictal.

As to controlling mania otherwise - I do not think you can.