Can't say anything about best, but I was just prescribed Prozac and will be on 20mg for 2 weeks and then moved to 40mg, maybe more if needed. If you've had the same doses for 2 months, maybe you just need to adjust them. Maybe?

Edit: From your post history it looks like you've tried a few things, including higher doses of Prozac. I guess I have nothing else to offer then. Sorry.