My husband recently started having difficulty breathing. This only occurs when he is in a sitting position or standing still. It gets worse if he is trying to talk. It is not painful to breathe in deeply, but he says that the muscles around his stomach right below the sturnum starts to hurt. He can no longer drive for any period longer than 30 min, and he must concentrate to breathe. He has always been a heavy night time breather, to the point where he wakes me up, not snoring, just loud breathing. This has almost stopped, I can no longer hear him breathe at night but he says that he is sleeping well. He says it does not bother him as long as he is working or moving. He can sing and not run out of breath. It is getting worse. The dr. has done a CT scan and EKG + the usual blood test. Nothing. His blood pressure is slightly elevated and is on Lescol for high colesterol. They will be doing several breathing test this next week, someone suggested Thorasic Outlet sydrome, but there is no pain anywhere else. Do you have any suggested test, the dr. seems to be out of ideas. Thank you, LZip2