This is Dr. David
ask the doctors if they ran a sensitivity and resistance panel on the streptococcal infection from the penile swab.
some strep infections can be resistant to certain antibiotics.
the sensitivity and resistance panel can see
is your HIV virus under control with a low viral load? are you getting treatment for your HIV?
I would continue to take the flucloxacillin and see your doctor again if you continue to have penis swelling and inguinal lymph node swelling.
you should also take a probiotic daily while on antibiotics to decrease chances of diarrhea from antibiotics.
let me know if you have questions.