hi! I also have sleep apnea and have used my cpap for about five years now. what kinda mask do they have on you? I couldn't use mine at all until I finally got a full seal face mask. they look kinda like this
is that what they have you using? you say "connected to your nose" which is why i ask - that was a big part of the reason why i was never able to use my cpap.
the other thing i'd recommend is a CPAP pillow. they're concave so they let you sleep on your side and stuff without the cable getting in the way.
that said, not being able to sleep doesn't always mean that there won't be any results. i wasn't able to sleep the first time i did a sleep study but they were still able to get info from my position, the way i was breathing, etc. so it might not be a total lost cause! either way sorry you're dealing with this, al lthe stuff around sleep apnea is so shitty. it took forever to even get a new machine despite clearly having sleep apnea for years as well.