You're doctor is right - you definitely have hsv2, and there is no way to know if it's a recent infection.
It can take up to 4 months to develop antibodies for hsv2 (which is what the test looks for), though most will by 6 weeks. The best that we can know is that you've probably had this for at least a few weeks, if not longer. You could have had it for years. Unless you know of a partner who has it, and you know that all other partners didn't for sure, then you may never know.
The numbers don't mean a thing. You could test next week and get a 14.9, and the week after and get a 10.78. It doesn't mean your infection is any less this week than next. It doesn't have any indication on outbreaks, or transmission, etc.
Your spouse should test. If he/she/they are negative, there are definitely steps you can take to help prevent transmission. If he/she/they are positive, there is no way you'll ever know who had it first, or if both of you had it coming into the relationship, and didn't know. If your spouse is negative, I can give you transmission stats if you feel comfortable sharing your gender and the gender of your partner.
90% of those with hsv2 don't know they have it, either because they don't have symptoms, or their symptoms are so mild they'd never think of herpes as causing them.
What made you test for this? Did you have symptoms? Are you concerned your spouse is unfaithful? Was it part of routine testing?
You should read the herpes handbook at https://westoverheights.com/herpes/the-updated-herpes-handbook/ It's free, and written by one of the world's leading experts on herpes.