Darlene, unfortunately this is complaint we have heard frequently lately.  It's not an easy problem to solve. Discuss this with your sleep doctor and perhaps he can write a prescription to help you relax and get through the night. Be sure to stress this is a real BIG problem for you.  In the meantime you might try one of the PM pain relievers with benadryl.  The benadryl helps you sleep while the tylenol (or advil or whatever) takes care of barely perceptible aches and pains which may contribute to keeping you awake.

One thing you can do is gradually increase the time every night/week with the mask on in bed to slowly become more accustomed with all the gear.  A hose hanger may help get the hose out of the way and reduce stress on the mask.

Something that helps me though it is against all the rules of good sleep hygiene is to turn the tv on to something calming, set the timer, turn over so the light is off my face and just listen to the voices.  I concentrate on the voices and it distracts me from the other stuff and I fall back to sleep  I have heard that sleep maintenance insomnia can be hard to correct.  Keep working for a little progress each day.  If the mask is uncomfortable keep searching for the right one.

Wish I could be more help.

Mary Z.