I'm a 60 year old male in excellent general health. I'm physically fit, active, and never smoked. I had my annual physical in December and got a clean bill of health. About 3 weeks ago, I came down with what I thought was the flu - body aches, coughing up mucus and 103 fever. I went to the doctor and was diagnosed with bronchitis, given antibiotics and prednisone. 2 weeks later, I'm still coughing constantly, but it's dry - no mucus, can't sleep and found I've lost over 10 lbs. My appetite is down, but I have been eating. I went back to the doctor, and they prescribed cough syrup and they ordered blood work and chest xray - both of which came back normal. 5 days later, still coughing, but I've lost another 6 lbs. I called the office and they said to be patient, that it takes time to recover from this, but I'm really worried. My body fat percentage is pretty low to begin with and this weight loss is severe. I was 5'9" and 162 lbs. I'm now 146 lbs. Should I seek a second opinion or is this normal and I just have to let it run its course?