@KateUK - If you still have breathing problems when laying down, I recommend using a pulse oximeter to see if certain positions are worse for you than others. I also feel like I can't breathe if I lay on my right side or my back or stomach. I'll wake up shaky and half-suffocated, and have a headache most of the day when it happens. I even managed to turn blue once Anyhow, the pulse oximeter shows that my oxygen saturation drops to bad levels 30 minutes when I lay on my "bad" sides. No idea how bad it gets after an hour or more!