I have a deep yucky cough for three weeks. I have been feeling weak and tired from the moment I wake up even after a good nights rest. I have even been taking naps. No fever but feels like I am on the verge of one. Interesting enough my PFTs are awesome but I feel like crap. And, the funny thing is I smell sick to me. Does anyone else have that when your sick and nothing to show for it but a cough and feeling exhausted?