TTC over three years, feel frustated most days

We had been trying almost three years, this was August/September 09, (Nov 09 is the three year mark) and I got a postive HPT, I was esatic, but it turned out to be a chemical pregnancy. I was devasted at first, but that pushed me to go to the doctor. I always knew in my heart we would have issues conceiving, one of my greatest fears, I had some tests done and turns out I have hypothyroidism (genetic, my mom is hypo, my sister was hyper eventually had it removed), I suspected i've had it for years, but every test for it came back "normal". For those unfamiliar with thyroid it can cause a whole host of problems and, until recently anything above a certain number, 5, was normal, however it's changed in recent years to anything under a 3, mine was 6.085. My cycle has also ALWAYS been irregular, I started when i was 11 and had MAYBE one a year, I kept waiting for it to sort itself out, but it never did and my mom isn't the type of person that talks about that stuff (periods, sex, etc). I also was diagnosed with insulin resistence (now on metformin for that), taking into account all my issues, my dr. diagnosed me with PCOS, which I also suspect for a while i'd had (I do a LOT of research on the internet). I took Provera late december (hadn't had a period since August) and it worked, but then i had another one five days after the provera one stopped? I'm assuming it's my cycle resetting itself which is okay by me. It does seem like everyone around me has either gotten pregnant (sometimes twice) or given birth while we have been on this TTC journey. My mom has been relatively silent about grandchildren, though I know she wants some (my dad could care less) some of my other relatives have inquired (my cousin, who is to be a father in July and my grandmother), SO's mom however...asks us everytime she sees us. We have chosen not to tell anyone (except my best friend) so it's intresting trying to avoid that question, lucky for us we don't see her much.