I have had trouble breathing for almost 3 years now. It seemed to start after I was exposed to some bug spray. I was treating a home and had set a (bug bomb) off that failed to work. When I went back into the home to inspect the effectiveness of the insecticied, the (bug bomb) when off in my face as I leaned over to pick it up to discard of it. Right after that I got a severe sore throat and cold like symptoms it took a while but I recovered. However, from that point on I have felt short of breath. If I get a cold or the flu the problem worsens. I feel like I have mucuc (something) stuck in my thoat all the time. I can cough up the mucus sometimes it is bright blood tinged other times it is yellow or clear. I cough constantly all day long. I can feel something deep inside of my chest it makes a barking sound if I cough hard enough to move it. When I lay down I feel like my airway is partly obstructed. If i cough up mucus the obstructed feeling still never really goes away. Also, I remodel old homes on a regular basis. I have went to my local doctor and he checked my thyroid by palpation, lung sounds, and lymphnodes did a breathing test that came back slightly abnormal but nothing to be concerned about I think he said it was 80% of normal. He then concluded that I was normal and sent me home with some nasal spray. But I can't breath! What do you think is wrong?