I have no idea why your provider would prescribe an antifungal cream to treat herpes. Totally different issues!!
At this point it sounds like it is way too late for a lesion culture to be of use anyways. Once herpes lesions start to scab, the odds of getting an accurate culture are pretty low.
So what do you do now? I recommend that you get a type specific herpes igg blood test 3 months after you last had sex. If you have a regular partner, you can both go now and seek out the igg blood testing to see who has what. If you both come back negative, odds are your symptoms aren't herpes related.