D.W.
C.,
Put the computer mouse down and step AWAY!!!!!!! Sorry, but online medical advise can be VERY scary. Yes there are reputable places to look for once you have a diagnosis- our practice directs people to places all of the time, but just putting in a quick symptom or two is NOT the way to go.
Fungus loves to grow in warm, moist, dark places. HE may have had some reflux which changed the pH in his esophagus thus giving the fungus a chance to grow. Uncomfortable for him, but fairly easy to treat.
AIDS is fairly uncommon in children in the US. In 15 years in a very busy MD's office we have seen 2 cases of HIV+ kids- both born to moms who had no prenatal care and did not know they were HIV+ themselves. The 3 or 4 moms who KNEW they were HIV+ when they got pregnant and stayed on their meds all had HIV- babies.
Relax- follow your nurses advice when she calls back :-)
D.