I agree with the posters above......however, I want to strongly emphasize that you should be laying down to start learning the diaphragmatic breathing Myzen is telling you about. Watch to see that your belly is moving more than your chest as you "relearn" to breathe correctly.

Almost all of your symptoms sound like they are due to improper breathing - too shallow and quick.

Also - I know exactly what you are saying about thinking there HAS to be something other that anxiety wrong.......I did that for 17 years. I cannot even remember all the Doctors I went too, trying to find out what was wrong with me. I would have been happy to have been told it was a brain tumor - or ANYTHING that they could just FIX. But, all tests were negative, and I learned to deal with the anxiety and panic. They are REAL, painful and scarey. I suppose the main thing was that I realized that nobody but ME could help me.......and I worked HARD, everyday. I soaked up every bit of information I could find, tried everything I could find to try to help myself. I had spent so many years undiagnosed, and on the "pity pot", that once I was told what was wrong with me, I worked every day to get better.......hard work for sure, but worth it.

Good luck !