C-PAP machine

Well I'm slowly getting used to this CPAP machine. I've almost given up on the full mask because the seal is too hard to get AND I feel kinda claustrophobic in it. I'm also still getting wicked neck cramps and sore chest every morning. This is from me trying to get comfortable in the night (sore neck) and using muscles I haven't used before for breathing. I've been breathing shallow for the last unknown years while I sleep and now I'm deep breathing. It should pass in another week or so... I HOPE!