MM, I totally undertand your frustration because I went through similar things before.
My suggestion would be:
1) see a good infertility specialist to prepare for the worst case (IVF). These doctors belong to reproductive endocrinology. If your period is irregular, there is a good chance that you might ovulate regularly.
2)relax and have faith in yourself and the modern technology.
3) ask your husband to eat oysters when you ovulate. I read on internet that oysters can increase sperm count. I don't know whether it is true. We tried this way, and I got pregnant (I also took drugs to induce ovulation so I knew for sure I was ovulating those days).
I told a friend of mine who was trying for a few years and she got pregnant too!!! She thinks the oysters made a big difference!
Good luck to you!!!