I have been using the cpap resmed s8 elite 2 for only 3 days...and haven't been able to keep it on--I keep taking it off during the night. I am a tummy sleeper and am trying to become a side sleeper. I am using a nasal mask with a setting of 11. I find myself trying to open my mouth to breathe. Also this is kind of crazy but the 2nd night at the sleep study center (1st time on a mask) the next day I had a stye beginning in my left eye...and today I woke this morning with another stye in my left eye. Haven't had styes before! Am I doing something wrong? Thanks for the help

