You poor thing! Bad enough when vascular or inflammation keeps one awake, but add to that sinus & lungs=zero sleep--which is miserable!!! Well, piggybacking on Peteza's thoughts, maybe a nice sturdy lawn chair that you can adjust? Or I see on overstock an inexpensive adjustable bed frame (you'd have to get a mattress -perhaps a tempur., then one covered to keep chemical level down)?
www.overstock.com/Home-Garden/Posture-Support-14-inch-Double-size-Adjustable-Platform-Frame/6780348/product.html?refccid=63PH3H5RFMZJNHSOAIAQII25NA&searchidx=42