I have found that people love to tell sick people to exercise. It sounds like a great idea. If you improve your fitness, your symptoms will improve. The only problem is that people were saying this to me when I had to ride a van for disabled kids to my college classes because I was unable to walk across campus. Exercise was a struggle for me the first few times I tried it. I would get so tired that all I could do is sleep. I had headaches, low-grade fevers, body aches and swollen lymph nodes within a day or two of trying each time.