My understanding was that HIV can't be caught through food because stomach acid neutralises the virus. Feeling pain for 9 days is long enough to justify a doctor's visit. It isn't HIV but there are other possibilities, most of which are harmless or easily treatable. But if you get that opinion, you aren't letting a problem like tonsillitis get worse than it needs to because of your HIV fear.
Then, you could perhaps read this thread-
obsessive-compulsive/topic103176.htmlIt is about an irrational fear of being gay, but I think the basic principles might help you with the HIV fear. It's REALLY hard to put into practice. But since you have been tested and do not have HIV, and once you've dealt with your throat pain, I think it's a good plan to try. And perhaps to get some help from a therapist, if you're still struggling. The impact this is having on your life says that it's serious. Even with HIV, life goes on. That diagnosis wouldn't be a reason to give up.