Fear of heights. am I getting better?

Okay, I have to walk about a mile to a job on certain days. I have to cross over this bridge that a high way runs under it. I used feel faint and almost wobble into the road. today my walk just slowed and for a sec I felt like crying. I did some deep breaths and I was fine. Also is my problem really a f ear of heights? I know (That's what a friend tells me.) I only feel faint or about to cry when the cars from the highway below zoom by.