I agree totally with your doctor. A sore or lump under the skin isn't herpes.
The thing about herpes blood tests is that while technically, a 1.18 is positive, most experts and the CDC feel that anything below a 3.5 needs to be confirmed. A 1.18 is a VERY low positive, which is officially 1.10 and up.
We know that about 50% of tests in the 1.10 to 3.5 range are false positives, and the lower the number, the better the chance of being a false positive.
It could also be that you are newly positive, but at 6 weeks, give or take, most people will test positive, and I'd expect your result to be higher.
Do you have hsv1 already? That's important to know because that can contribute to a false positive on an hsv2 test, but can also SLIGHTLY delay developing hsv2 antibodies (there's some debate on that, but I'm putting it out there so you have the full picture).
In any case, getting herpes from a 1-time, protected encounter is unlikely - you have about a 1 in 10,000 chance of it. For perspective, you have about a 1 in 3,000 chance of getting struck by lightning this year.