I agree with Perna, I went through the same things you are, thought for sure I had lung problems, its best to go to the Dr. to get blood work done, and have them check your O2 stat, and then when they tell you everythings fine, your mind will be at ease, and you will realize its anxiety. I suffer from anxiety and when my mind is occupied I tend to not notice the signs of anxiety. I take medicine to control my anxiety disorder, but at first I thought I was sick scared and went through alot of procedures even a heart cath to find out it was my nerves all along.