Stopping Depro

Hi there, I was on Depro provera for about 3 years. I fortunately didn`t have any bad symptoms. I had my last injection in August this year as my husband and I want to start a family. My periods have still not appeared. I have experienced terrible lower tummy cramps, lost appetite and a bit moody! Could it be withdrawal symptoms??? How long will it take until everything is back to normal? Anyone experience the same things as me?