K.C.
E.,
I had the exact same thing last year! I am sorry to say that nothing worked, I spent the entire pregnancy sleeping in a chair because I couldn't breathe the minute I laid down. My dr let me take zyrtek and rhinecort nasal spray. I used my nasal rinse every day and nothing made it better. Within a week of having the baby I felt much better. I hate to say it but I think the baby is doing it to you. My Dr. said that some of us generate a lot more mucus than others.
I wish you all the best!
K.