That is an immensely reassuring answer, thank you HowardH. Sorry to be disrespectful but might I ask what credentials you have or, if not, where you've read all this?
I find it hard to believe that a reaction to the condom would take 2.5 days to appear... The fact that a rash is there makes me believe that the condom MUST have broken. The other person was also transgender, which combined with their ethnicity means the risk is incredibly high and warrants PEP from what I've read (and I've done nothing but read this stuff for several days now).
Thanks again!
Most penile rashes aren't due to any STD, and no STD (or HIV) would cause the leg tingling -- and anyway, it sounds like you have an obvious explanation for that symptom. Given how quickly the penile rash developed, I would guess maybe an allergic reaction to latex, or perhaps to spermicide. It was too soon for herpes, doesn't sound like herpes, and since the doctor agreed, you can put aside that concern. In addition, herpes lesions would never clear up within 1-2 days, even with treatment. I would advise stopping the anti-HSV treatment.
There is also no way this is ARS, symptoms of which cannot start sooner than 7-10 days after exposure. There is no such thing as "uber early HIV", regardless of the strength of one's immune system). And the symptoms are wrong anyway. And you had protected sex. (You wouldn't have missed a broken condom.) Most experts would not have prescribed PEP in this situation. However, now that it has been started, any questions about it will have to go to the clinic or doctor who prescribed it. But I doubt it was the cause of the transient penile rash you had.