You already had herpes in your anal area before the lick. Herpes infects nerve groups, and genital herpes infects the sacral ganglia. This affects the entire area covered by boxer shorts. At any time, you could have gotten outbreaks on or around your anus.
My guess is that you have a prostate issue - either inflammation or an infection, a pinched nerve, maybe even inflamed discs. I'd urge you to see your doctor for a prostate exam, urine testing, some imaging of your scrotum and back, if you haven't already done that. Who's decided that an ablation is necessary? Have they ruled out every thing else?