Have they tested yout son for Addisons Disease. My son was diagnosed when he was 16 years old. His Addrenial glands shut down. He was so ill until they figured out what was wrong. He had flu like symtoms. He was very sick to his stomach, his blood pressure was unstable, the tissue around his eyes was like a brownish color, he could not get up real fast, he would get very dizzy, the brown pigmetation is a sign of addisons and so is all the symtoms you just listed. My son has to take a steriod pill everyday to remain well.Your addrenal gland release a natural steriod that is released when your body needs it, such as when your stressed, sick or doing sports and basically everyday activity's. Is your son very tired, that is another sign, call your Doctor and talk to him, he will only get worse if He has Addisons.Please keep me posted, If he dose have it, ask this discussion board for my e-mail address and you can e-mail me more on a one on one level. Karen W.