My son has been sick for 2 months. He had 2 cases of strep throat, within 2 months. (He apparently has had mono, but the doctor said it was not in last 3 months. Had blood test to determine this, along with many other abnormalities that could be present). When he got sick 2 months ago, his symptoms were sore throat, fatigue, and have now have developed into severe headaches, that come and go daily, fatigue, and nausea, sometimes with stomach pain. He no longer has sore throat. He has been on 3 different antibiotics, and just finished a 3 day zithromyacin 2 days ago. He had an MRI, a week ago, on his head , since he is having so many headaches. Nothing came of it, except that it showed he had a sinus infection, thus the z-pack antibiotic. Not sure what to do or what type of doctor I should have him see, for the symptoms he is still experiencing. Any advice?