What fatigue is about? What your body is trying to say?
Fatigue is a physical or mental weariness resulting from exertion. In this case you used more energy you should and this lead to fatigue. Also this energy can be drain by stress or intellectual work, not only by physical exercise, physical work etc.
Converting it on human language – your body is begging for more energy. You should have a decent rest to restore energy buffer.
In your case energy was depleted during fight with cold. In addition your resting is not perfect – you are not able to generate enough energy to cover this fight and have enough on daily tasks.
More about chronic fatigue syndrome is here >>> http://chronic-fatigue-syndrome.microalpha.com
Proposed on this website solutions are not interrupting any wireless communication.