In no way do I want to encourage obsessing when a doctor says we are physically normal but from experience I completely agree with the post
in the thread Can anxiety cause chest pain about getting a second opinion. It took me several doctors, some who were downright nasty (I was somehow wasting their time it was all in my head) to find out my breathing and chest pains were in fact asthma. The asthma doctor couldn't believe they said my chest was clear. But the way he listened to my chest was unlike any way any doctor or nurse has listened to it before or since. Kinda scary, and made me a bit angry. Anyway, please don't work yourself up any more but sometimes we do know something isn't right.
Peace to you,
Spinnaker