Have you tried just talking to your general doctor?? If it's an infection, they will be the ones most likely to catch it. Sit down with them and tell them all of your symptoms, although sometimes, I find, if I am worrying about things, sometimes my mind will play tricks on me, and make me feel like things are worse then they are!!

Second opinion doesn't hurt, but i would maybe check with your general doc! Mine was the best for a lot of things that my other docs just weren't getting.

Best of luck to you