Question.

I've been on the shot off and on since I was 17 and when I got with my boyfriend I wasn't on it and I believe last year in August I had a miscarriage but wasn't having any signs of being pregnant, I was taking care of my dad who passed away in June of 2014 cause he had cancer and tight around then is when my bf and I got together but when my dad passed away June 25th I was drinking a lot and I'm August I had very bad stomach pains where it doubled me over and then I started bleeding but ever since then I've been having issues, I have two cysts on my right ovary and I keep having symptoms of being pregnant but I'm not and everyone says I might have PCOS. Every time someone mentions they're pregnant I get down. Also I found out I had an std for almost 6 months because my bf didn't know he had one etc does anyone know what could be wrong? Or give me advice? I don't know how to go about getting this all checked out because my doctor said its nothing to worry about and I'm scared that when him and I do finally decide to have kids I'm not going to be able to.