Zero risk means zero risk. No one in the history of HIV has ever been infected by receiving oral sex and you will not be the first. Your symptoms have nothing to do with it. If you're not feeling well, go see a doctor, but HIV has already been ruled out as a cause on account of NO exposure.
Sore on your tongue could be due to numerous reason but HIV since you weren't ever at risk. Please see a GP for your ailment, HIV is not your problem.
I agree with the others, HIV is not transmitted through receiving oral sex regardless of tongue issues. Saliva and air inactivate the virus. The only way adults get HIV is from unprotected vaginal or anal sex or sharing IV drug needles. I'm sorry you are sick but it is unrelated to HIV.