Depo-Provera

Has anyone taken the Depo-Provera shot? I took my first shot last year in November and my second one this year in February. I was told my cycle would stop by now but it hasn't stopped. Did anyone else have this problem? I'm miserable. It helped stop my migraines and cramps but now I am nonstop bleeding and my face is full of acne. How long am I going to be miserable?