Can't Breathe through my nose

I Had a sleep study done and it showed I got up 50 times during it.  I haven't been sleeping well for 6 months 2-3 hours every night here and there.  I'm never able to hit rem, I think this is causing my blood pressure to rise and also making my body very shaky.  My nose is always very stuffed up and most of the time I have to breathe through my mouth.  Even with nasal sprays, I can't breathe though my nose.  Doesn't anyone have any ideas on how I can get better sleep and breathe through my nose, I think that might be the problem????