Your symptoms are unrelated to HIV, please see a doctor for your concern.
Receptive oral sex is not a risk for HIV transmission, there are no 2 ways about it. No one ever has been documented to acquire this virus in that fashion. Please move on.
As is said above, you can't get HIV from oral sex. Air and saliva inactivate the virus. Giving or receiving, it makes no difference. You did not have a risk. Use condoms for penetrating anal or vaginal sex and don't share IV drug needles and you'll never have to worry about HIV.;