Hi! I too experienced infertility for unexplained reasons. The only thing the doctors could come up with was my AMA (Advanced Maternal Age) - gotta love that term! We conceived a child through IVF when I was 38. I did it through a doctor in Nashville. If you e-mail me, I will be more than happy to talk to you about my experiences. I went to see two doctors, but of course chose one to do the procedure. They implanted 4 embryos - I had one successful stick, and one ectopic (which is VERY rare).
The process was grueling at times, but oh so worth it with the outcome. Like you, we were so afraid that the process wouldn't be successful, but we really tried to keep a level "business-minded" approach to it. To get too caught up in the emotional aspects of it would have been too devastating for me to handle. It is expensive, and it's a risk, but without out it, I wouldn't have a fabulous little 3-year-old running around my house today!
As a PS, I'm now 41, and pregnant again. This time it was through natural circumstances. Surprise!!! Wasn't really trying because the hope of conceiving without medical intervention was not really an option. Don't know the IVF pregnancy sort of kicked body into knowing what to do, or what. Don't care, just thrilled over this surprise gift from God!
What I hope you get out of my post is that 38 is NOT old. You still have lots of options... You'll be cared for a little more aggressively than a younger mother, but it's not too late to pursue conception. Good luck! And again, if you'd like to talk, I'm available...
HUGS!