DEPO

I started on the injection 6 to 7 months ago. As soon as I got the second one I started to bleed rather heavily. I have had really bad mood swings and put on nearly 2 stones which is getting me down. I have had really bad cramps in my legs, hips and tummy. I didn`t get my third shot but the symptoms are not getting any better. Infact I feel like they have got worse. I went to my doctors for help and it was like talking to a brick wall. All he done was give me the pill which I have not took. Does anyone know what I can do.