I had bronchitis back in the summer, 6 months ago, and continue to be extremely tired and unable to exercise without starting to cough again. I take a 1-2 hour nap after work every day and can still go to bed by 9 or 10 and get 8 more hours of sleep. Sometimes I cough up "strings" of mucus (literally- rubbery strings and nothing else), but otherwise coughs are unproductive. should I have concerns? xray in september showed no masses or lesions.