1. Very low, but not zero, but very low
2. Not only is there no indication of whether he is infected or not, but he may not be actually positive. His value falls between 1.1 and 3.5 and should be confirmed with western blot (through Quest, 34534).
3. Western Blot, if he's waited long enough from last possible exposure to testing
4. 4 months from the encounter. However, he can get his western blot confirmation done way before that (again, pay attention to HIS timing of testing) and you'll know a lot sooner.
5. If your HSV 1 and 2 were both negative. you are more likely to be symptomatic with your HSV 2 acquisition. I don't have a specific percentage for you.
Try to be less distressed, I think there's a good chance he isn't even infected and if that's true, then you have no worries, right?
Terri