Thank you for your post. I was last year monitorized for apnea problems during my sleep, and the results were ok. I had also two spirometries and were also fine. My pneumologist told me everything was fine..she told me we were done. So I am visiting a neuro doctor specialized in the vegetative autonomous system to try other tests, those might be tilt table, vasalva maneuver.. I don't know what else that might be. This is s very complicated desease with many medical issues involved..