Sometimes, after the 4-6 weeks are up, people require a dosage increase also, as the med may be
working, but
not to the desired level yet. So, as you can see, sometimes it takes a couple of months to get to where you would like to be. Try to think positively (I know, easier said than done).
You're feeling lousy, and want to feel better NOW. I know, I remember feeling like that, and remember thinking 4 weeks seemed like a lfetime, but it isn't.