Thanks. I had a sleep study, but never slept on my back. They had to wake me up and ask me to lay on my back for about 15 minutes. I guess everything looked okay for those 15 minutes. Normally, it is very uncomfortable and hard to breathe.

I'm sorry--that is my description of my "breast bone". No doctor has really looked at it. I have been to endos to look at all reasons for my symptoms, and have seen a few cardios and also had the dysautonomia testing. I do have standing issues.

Along with me noticing that Ach is something I seem to have an issue with, my pulmonologist mentioned it on my first visit. I then spoke up and told him I had been thinking about it too. Of course, he did some kind of lab test, but said everything came back normall.