Well first of all....
Everyone on this board knows exactly how you are feeling today.
I was worried to go to the doctor too. But I felt a million times better once I did. We got awful news, but still it was good to finally know and know what we could do to help.
Regardless of going to the doctor if something is wrong, it's wrong. Like with us... we tried for 10 months and nothing. If we didn't go to the doctor and find out what is going on we could have tried for the next 10 YEARS and never have conceived. But now that we know that conceiving naturally isn't going to happen we can take steps to get help.
KWIM??
The GREAT news is that you have a daughter, so conceiving isn't impossible for you. I'm sure if something is up it's nothing major. Could be something clomid or something like that could easily fix.
Keep your chin up.

We are here for you