I was so surprised to discover that after my last Chemo I didnt bounce back like I had before. Infact, I recall my lungs having been affected and it took time for the deep breathes to feel normal. The doctor I see said it is a side effect of chemo, and the other said she thought I may have had fluid on the lungs, but I wasnt coughing. I had 6 weeks before I began Radiation and I was feeling just like you and similar symptoms. I am still not very energetic, and have lots of sleeps and only go for half hour walks 2 months later !