You should have your doc take an xray and check out the lungs. It could be Valley Fever. I've known several people who had the same symptoms and later found out it was VF. It is treatable with meds but you don't want to let it go too long. One friend ended up in the hospital for weeks. Go on line and check out the symptoms of Valley Fever. Have you been or live in an area that has new building going on? Good luck with that cough getting better. Beebs.