I had something similar about 10 years ago. It got so bad that my boss at the time forced me to go the doctor. I was so short of breath and dry coughing all of the time that I had no energy. My brain was definitely O2 deprived. What I had was asthma-like, but not true asthma. Prednisone and an inhaler helped immensely. The symptoms went away after 6 weeks, but then came back after I stopped the medication. I have been dealing with it off and on since then, but it has never been quite as bad as the first time. I am also taking Prednisone every day and I think it keeps some of the lung inflammation at bay. I get worse when the weather changes or when it's really damp. I also get triggered by smoke and strong chemical smells. Definitely get yourself checked out.