Irregularities after depo shot

I had one shot in September of 2013 and ever since that shot I have been extremely irregular! I'm going on a 11 day long period now. I'm getting irritated and upset I want to start ttc but how can I if my cycles are all over the place it's been almost a year since I was suppose to get the 2nd shot (but never did) I've lost weight (18 pounds) and I'm still irregular. Anyone else share in this frustration?