I have been sick for the fourth time within one and a half month. At this rate, it's impossible to build fitness. In the beginning of December I was hoping to be at my top level again in February or March. Instead, I'm going backwards.

It seems that there are still things about my body since the CFS onset last year in April that I do not understand.

Why was I progressing so rapidly in September, October, November and December only to find myself knocked down completely in January? Why do I get sick all the time now? What can I do to not get sick again?