Aw, I'm sorry.. It's probably like you told me before, that you are 37 weeks and your baby still has not dropped, and is probably very-much crowding your lungs.. I am sorry!! I hope you get some relief soon. :( When I used to lay down my lungs felt like they were collapsing onto themselves and it made me cough.. :/ And I wasn't even as far along as you are, I can't imagine it. Hope you feel better.
I know that feeling all to well... Its been so hot here lately I feel like I can't breathe either.... at least the baby is finally letting me breathe a little easier now that she has dropped :o)
oh dear i hope you feel better soon, i have no idea what kinda pain your going through im sorry, soon youll have your lil girl :)