I think I have it. I made a researched online and these are the symptoms, sore throat, growing lymph nodes on my neck and armpits, no matter how long I had sleep (I only sleep 4 hours a day) it is still unrefreshing and I always get tiring morning, muscle pain which I had a lot, all the time, lost of concentration, memory loss, when I try to exercise I get exhausted easily and I cannot breathe, and last, too much headaches. I have all the symptoms. This is due to over work. Even though I do not go to the doctor, I have CFS or Chronic Fatigue Syndrome. These causes by consistent viral infections, failing or weak immune system, and hormonal imbalance. It is very risky with age. You are prone to different kinds of illness if you will not be check by the doctor. You need to drink medication because it leads to depression.