Facial AVM and sleep apnea mask pain

I have a facial AVM and also sleep apnea but the mask I use hurts my face due to my AVM, the pressure, etc. I am a mouth breather so have to have full face mask. I have tried a foam mask but it still causes pain although not quite as bad. Bottom line, I stay tired a lot because I do not sleep well. Anyone else have this problem and any solutions or suggestions?