Unfortunately, no test is available to determine whether an HSV-1 infection is genital, oral, or both, except to try what you already attempted: testing an outbreak for herpes to determine virus type. The best I can suggest is to await another outbreak and see a provider very promptly (within a day of onset) for repeat testing. You could consider stopping acyclovir; you are more likely to have a recurrence that can be tested if you aren't on treatment, and being on acyclovir might be the reason your culture test was falsely negative.
Certainly the appearance of a genital blister is consistent herpes, and likely means you indeed acquired genital HSV-1 at the same time you acquired it orally. Breakthrough lesions can occur on acyclovir. On the other hand, fever and chills are rare with recurrent genital (or oral) herpes, generally seen only with first infections. So perhaps something else was going on, but that is speculative.
If not done recently, you might want to have a type-specific blood test for HSV-2. Although recurrent genital herpes due to HSV-1 can happen, the vast majority of recurrent genital herpes lesions are due to HSV-2. In other words, if your blood test is positive for HSV-1 only, you can assume with some assurance your genital lesion was due to HSV-1; but if positive for HSV-2 (with or without HSV-1), you should assume you have genital herpes due to HSV-2.
Finally, whatever else is going on, vaginal burning and leg pain going on "for weeks at a time" almost certainly are not due to herpes. Look for other causes for those symptoms; herpes outbreaks simply never last that long.
Good luck-- HHH, MD