And Dr. HHH is awesome, and we miss him here. You can trust what he says.
Your symptoms have gone on too long to be considered prodrome, which usually last a day or two, tops. Given that you have seen improvement with the antifungal, I'd say it's more likely to be fungal than herpes.
Also, dull lower back pain can be indicative of many things, but not usually herpes. Depending on how low, it could indicate a UTI, so if that lingers, get that checked.
Herpes rarely goes from the genitals to the mouth, so if she has genital herpes, which we don't even know if she has, it's unlikely that you'd get it orally. If you get a cold sore, it's likely that you already have hsv1. Most people who have it don't know they do.
I suspect that at least some of this is a heightened body awareness being worried about getting an STD. I'm not saying it all is, so if it lingers, get it checked out.