My son, 15, has been fighting something for about 2-2.5 weeks. Started with extreme tiredness, then headache and throat discomfort, not a sore throat but said itfelt weird and waxy, cough, fever off and on, and dehydration. Went to doc and tested neg for strep and mono. This week it seems to have gotten worse mainly the headache and fever. He said tonight that his chest hurt a bit. Any idea what I m dealing with? Or suggestions?