Have you taken all the antibiotics? Did they do any actual STD testing, other than looking for WBC in your urine?
You can get gonorrhea from unprotected oral, and there's a lot of resistance to cefuroxime now. You should have had a shot of ceftriaxone.
It's also possible that you have NGU, which is an infection in the urethra caused by anything except gonorrhea. Normal mouth bacteria can cause it, as can things like strep, adenovirus (what causes things like bronchitis and other upper respiratory infections), etc.
I can't see your pic, so I can't comment on the blisters, other than to say you need to let a doctor check it out. (You have to download the pic, and I don't download things I'm not sure of the source.)
They should do a urine test to look for white blood cells, a gonorrhea test, and should culture the blisters, if you haven't waited too long. They can try to do a PCR swab on them, which is more sensitive than a regular herpes culture.
You should also get checked for a UTI, where they send the urine out for culture to look for bacteria.
Beer wouldn't affect you if you had herpes, unless you had sores in your urethra, but that would hurt every time you urinated, not just when you had alcohol. Alcohol can really irritate a UTI.
So long story short - you need to go back to the doctor, and do it soon.