HIV is only spread by direct and immediate contact. Mutual masturbation is not any of those things, as sexual secretions have been exposed to air before getting in tough with your urethra. When two or more people masturbate each other, it is normal to have sexual secretions on their bodies and genitals. But, in 40 years there has never been a single case of HIV transmission that way.
Mutual masturbation is a Zero Risk activity. HIV does not transmit through this act, no matter what "ifs and buts" you bring to the table. Your risk never existed. Symptoms you mentioned, have nothing to do with HIV infection