Nailing this down might be tough. I was ok for 3 weeks or so on my old machine and before I started taping. I have no idea what my numbers were because that machine provided no information. Then I got the new machine and was able to see the numbers. They were high enough (14.4 AHI being the highest with numbers in the 6 to 8 range otherwise) that I felt I needed to do something about it. That is when I found out I was puffing air out of my lips and I decided to tape. That is when I started having the pain in my sides/upper chest area where the top of the lungs are and the top of the rib cage. The only other thing that I have done different during this period is I started taking Prilosec OTC because I think I have Acid Reflux.