Daniel, I'm not sure if I can help you out very well, but I can do my best.
I as well, have participated in male to male sexual contact, protected and unprotected oral and anal (but it's been quite a while since I have been at any risk). I'm actually a sufferer from constant geographic tongue. I can't remember how long it's been reoccurring in my mouth, but it has been a long time. I also have bumps in the back of my mouth and stuff of the sort as well. Sometimes my throat gets real dry and my neck will hurt as well. As for the neck thing, you might want to have a chiropractor check it out, because I had something like that, and I just had to change some of my posture and things got better.
I get weird stuff going on in my mouth and my body all the time. But I have been tested negative for HIV, Gonorrhea, Syphilis, and Chlamydia. My testing window for all of the diseases have closed and I have confirmed them several times to keep myself and my other partners at peace.
While what is going on with you is scary indeed, I wouldn't go straight to HIV, even though you did have a rather risky encounter.
I can't really tell you what you have, because it's a lot like mine and not even I know what I have. I'm going through a similar medical confusion as well. But I can tell you that from personal experience, this is not HIV.
You should read over this, it may calm you down a bit until your results are returned to you. I hope (and expect) good news.
http://www.medhelp.org/user_journals/show/88524/HIV-THE-FACTS