Diagnosed with post viral fatigue after 2 week fever unknown origin. besides having days of extreme weekness i constantly feel hot, especially around the head/cheeks. airconditioning/ice pack makes me feel better. why do i feel hot like this?

Follow up with: Normal, healthy people do not have "constant tiredness" without a good reason. One's primary care doctor can look for reasons for fatigue, such as anemia, infection, mental illness, auto-immune disease, thyroid problems, cancer, insomnia, etc... That means seeing the doctor regularly until symptoms resolve, mainly to make sure there is nothing else going on other than "post viral fatigue."