So first, you've had oral herpes for a long time, which means you have antibodies that protects you from getting hsv1 in another location on your body. Autoinoculation (infecting yourself in another part of the body) is not that common, and your doctor is correct - you'd have to directly touch a sore, then touch your genitals or your eye, or whatever.
Also, you're on acyclovir. That would make it really unlikely that you'd get a genital outbreak. Genital hsv1 doesn't recur nearly as frequently as ghsv2 does, and many people only get one outbreak, and never have another.
Some people have reported feeling nerve-like pain on acyclovir and Valtrex. Usually, if you feel it on acyclovir, you won't on Valtrex, and vice versa. It may also just be normal twinges that you are hyper-aware of because herpes is causing you so much anxiety.
If you have a lesion that looks like a blister, you should see a doctor TODAY and get it cultured. Ask for a type-specific culture or PCR swab. Go to an urgent care if you have to, but the sooner you get it cultured, the more accurate the results will be. After about 72 hours, or the blister has popped, it's hard to rely on a culture result. The PCR swab is far more sensitive, but not every place does that. Insist that they culture it if they think it's herpes. A visual diagnosis is often wrong.
How do you know your partner doesn't have herpes? Has he been tested with a type specific IgG herpes blood test? No symptoms doesn't mean he doesn't have anything.
Go to the doc today, and let us know what happens.