You are overthinking this.
1 - If you have hsv1 orally already, even if you got another strain of it, your antibodies would protect you from getting it in a different location. It would be very rare for you to get it genitally. The only exception might be is if the person rimming you had an active outbreak at the time, which you don't mention.
Oral hsv2 is rare, and when it happens, it rarely recurs and rarely sheds, meaning it rarely transmits to others.
2 - How old was the sore? The cultures are most accurate within the first 48-72 hours. If this was a PCR swab, that's far more sensitive than a regular culture, and can be done on sores far older.
3 - Headaches can be caused by so many things, including stress and anxiety. I wouldn't worry about that as related to herpes. It could also be related to something else that is causing these sores. I don't know what the major leg pain was, but if it only happened once, and you've had these sores recurring, I wouldn't relate that, either.
4 - Recurring this often is very frequent for herpes, even with a new infection. I'd expect by now that even if it was hsv2, you'd have antibodies to help keep it in check.
5 - I'm not a derm expert, but maybe MRSA or staph, hemorrhoids, skin ulcers. When you say it opens - does it bleed? Herpes doesn't bleed, but hemorrhoids can. Also, you said this started a month after the encounter - that's a long time for herpes symptoms to appear. Typically, they appear within 2-12 days, with 4 days being the average. Obviously, that's not a hard rule, but appearing at a month would be atypical.
When do you get your culture results back?