Sleep apnea help

I have a sleep apnea machine REMSTAR Plus.I applied for wls surgery and this is one of my co morbidities.I have had my machine and I use it every night.It helps me so much.My insurance wouldnt pay for it ,ask me to have another nsleep test i did.I have severe sleep apnea.All those doctors cant be wrong on the reading. Both test showed i have it ....i just didnt get the REM they wanted.How do I appeal this and has any one else been down this road.Will the insurance compaNy still count this as a morbidity if they wont pay for the machine .This has me so worked up.I'm scared to sleep with out my cpap machine.I have select Blue. Thank You for your help hugs Kay