Been fighting a respiratory infection of some sort for a year now, it comes and goes. Just when I think its gone, it pops back up and all the congestion and hard breathing starts all over. I haven't been riding any distance since it started as a nasty cold. The worst part is my doctor says its been going around and he's seen hundreds with it. Antibiotics have done nothing. I feel like I aged 15 years in 12 months. When it clears up, I feel like a million bucks but as soon as I get active again it returns.