i am very sorry. i cant help, but i can tell you the story of my moms brother.
about 20-25 years ago my uncle and his wife broke up. well, he decided to move back up to PA from FL (where he lived with his wife) after a few years of reckless behavior after the breakup.
a year after moving back in with my grandparents, he woke up one morning and couldnt see. my grandpa took him to the hospital and they diagnosed him with syphilis, which was caused him to loose his sight. since he was diagnosed with one std, they decided to test him for all stds. they also discovered he had HIV.
if i can remember correctly, this was probably around the year 1990 or 1992. and to make a long story short.. he has been on 'the cocktail' off an on since this happened. he took it for about 5 years and stopped because his count was waaaay low (it basically looked like he didnt have HIV anymore). he goes back on the pills every so often just to keep his levels low. he looks healthy (still kind of fat!) and hasnt really shown any affects of it.
there is hope. and i REALLY hope that your son finds the right treatment! and i hope that his girlfriend still has hope as well. i will be thinking of you and your family.