Although this is certainly not my area of specialization, I do know that there is a great deal of information available on the psychological processes involved in the progression of AIDS. I am surprised that you are having difficulty finding information. I would suggest that you try a straightforward Web search on AIDS or a Medlines search on AIDS (or use "AIDS" and "anxiety" or any other psychological term you are interested in if you do not want to be overwhelmed by hits). You should get more information than you can process. Good luck!