The hsv1 IgG does miss 30% of infections, and 8% of hsv2 infections, but from oral sex, you are only at risk for genital hsv1, or ghsv1.
Herpes is a cluster of blisters, not a single pus-filled bump. Yes, doctors can misdiagnose, but they can misdiagnose anything.
I'm not sure why you are worried about this 10 years later, but you should let it go. Two-thirds of adults globally have hsv1 orally, and another large chunk have it genitally - we aren't sure how many, exactly - so if you are trying to avoid it, that's going to be very difficult.