Depo shot!! help!!!

So I had a abortion last October. Before that I  always had my period on the 23rd of each month since I started it. After my abortion they put me on a depo shot. They said I would spot for 3 months until my next shot then eventually it would stop. I had a whole period for 3 months straight !! After the next 2 shots I was still bleeding every day uncontrollably. They put me on a birth control pill. It took a while for the bleeding to stop. I've now been on this pill for about 6-7 months. If I don't take the pill exactly on time I start bleeding again. I have a period once a month for a week now. It's like the only thing stopping it is the pill!! Eventually I'd like to get off the pill without bleeding all crazy!! Any thoughts??