TTC is driving me CRAZY!!!

Ok. So basically to make things short I MC in June of last year at 12 weeks after 7 months of trying. I them MC again in Oct. I had a chemical in April. We've been trying so hard, using preseed, sex every second day then every day during ovulation. I am still not pregnant and sooooo frustrated. Beginning to feel as though this will never happen for us...ever. I know a lot of people are going through the same and I'm so sorry for that. I don't know what to do and where to turn next. I'm beyond frustrated.