Okay - an easier way to sleep with breathing trouble, it looks funny to others, but it works for me, and maybe will for you.

Get two pillows. Sit cross-legged on your bed, and fold the pillows in half on your lap, so they make a nice tall stack. Pull blankets over your shoulders, then lean over, fold your arms and rest your head on the pillows. Nighty night!

This is what I always since I was a child when lying down would make me cough. Try it - you've got nothing to loose at this point, and Simba won't laugh, I promise!