I missed that you only had oral sex, not vaginal sex. As GuitarRox mentioned, you had zero risk for HIV, so any test you take at any time will be accurate, and negative.
Drinking beer has no effect on anything related to HIV transmission.
A DUO test should be taken at least 28 days after the event in order to be fully accurate.
No comment on symptoms as they are not indicative of whether someone has HIV or not.