Hope you feel better soon!
I have the same thing lately and it's constant. I am 58 and it started when I was 18. It was under control for years. It came back slowly, first waking me up and of my sleep and now almost all day until I am able to fall asleep. I went to the ER last week, but I am not convinced there is nothing wrong with me. I am going the the Breath and Lung Institute just in case the ER missed something. I want to take a nap, but the minute I lie down, I will start obsessing over my breathing and need 40 deep breaths to calm me down.
Good luck.
you can email me at EroToo1 at aol.com