I was diagnosed as being hypothyroid about a year and a half ago. Well, about 8 months ago I noticed I was having trouble catching my breath while excerising. About 3 months ago it's progressed to where I can't catch my breath all day everyday, even while relaxing. I also feel like theres a huge lump in my throat and I also have diffuctly swallowing. I've been to the ER dozens of times and they all say I have anxiety. I know I don't and am scared that I will just stop breathing sometime. Lung doctor says I'm fine, so I was wondering if my thyroid could be causing this. Would removing it help?