I agree about getting a second opinion... a lady I know struggled with infertility for *years* and then got her blood sugar regular and conceived amazingly quickly.
On the other hand, as a childless 46-year-old, I do a *lot* of nurturing that is only possible for me to do because I don't have kids. (I also find that I simply don't feel that anything is missing from my life because there aren't kids... I truly, honestly don't have the urge and have always wondered what it was like - you have my sympathy if not empathy there!)
I do have family, and there is tons of love in my life in little and big ways; I have consciously cultivated close friendships and/or other have cultivated them with me.
And I have my bikes!