I replace headgear every six months. For me the straps are stretched out and beginning to degrade by then. The nasal pillows, I replace about every 2 -3 months. They don't visably seem to have degraded, but I can always tell a difference in my sleep when I change them. I get less leaks and events ch...

PaJoe, the way you describe your pains sounds similar to me. I suffered an injury to my left shoulder 4 years ago and developed chest pains and cramp like feelings on my right side, I developed numbness and tingling in my hand. The orthopedic M.D. didn't know. Several P.T.s didn't know. Finally afte...