Hi I'm A 28yr Old Female And I Have Been

Hi I'm a 28yr old female and I have been using depo povera on and off for about 10yrs. I have never had any serious side effects in the past but this year after starting the shot in march I noticed a terrible weight gain mostly around my tummy area. I actually look about 4 months pregnant.
In this year I have taken 2 3month injections and because of the weight gain I have become depressed and did not wish to continue on depo, in october I decided to give the 2month injection a try, but I'm still not satisfied. I do not mind the little extra weight on my thighs but my tummy really looks bad.I was due for my next shot 6 days ago but I've decided not to continue. Is this a common issue for women and is it likely for my body to return to normal soon?