Your symptoms may be "Psychosomatic", aka, being caused by the anxiety and stress of living with the fear that you think you have HIV. It's very unlikely that you have it, and if you continue to think that you do, the symptoms might just get worse.
I have had my share of HIV related anxiety, only to find that I am not infected. Plus, there are very few (if any) documented cases of HIV infection through oral sex.
You should read this journal from nursegirl6572, I believe it would help your anxiety a lot:
http://www.medhelp.org/user_journals/show/88524/HIV-THE-FACTS
From the journal:
"First, the virus isn't present in the saliva, making infection impossible for the receptive partner (the person receiving oral sex). Secondly, for the person GIVING oral sex, THEIR saliva contains enzymes that inhibit the virus, should they be exposed to infected genital secretions. Secondly, again, the virus has been exposed to the air and elements, rendering it inactive in an oral situation. This debate will continue, but again, for anyone worrying about an oral 'exposure'...think of the facts. If it was truly a risk, there would be newly reported cases ALL the time."