What do you ladies think?

Last year me and my fiance found out I was pregnant, we were beyond excited we were so happy we had already started shopping (: before I got pregnant we were trying for a few months, then just decided to let it happen and it happened. Then I had a miscarriage October 18 of 2014. We were so devastated it hurts so bad it still hurts and I know it hurts him. I didn't get the D&C shot (I believe that's what it's called) after, because the doctor said everything cleared out. But since the miscarriage we have been trying but haven't had any luck, sometimes I wake up sick in the mornings and when I do go to the hospital they just give me a shop and put me to sleep for a little while. What should I do? How should go out finding out if it has something to do with me not getting pregnant? or what are some things I could do or change in my diet maybe.