Hi 20%er,
I'm sooo sorry to hear you've joined our ranks. I really sympathise with your frustration from being misdiagnosed for so long. It's a real problem in the medical field, unfortunately. It is estimated that as many as 90% of people who have genital herpes don't know it because they don't get symptoms or don't recognise their symptoms as being herpes. So you're far from alone in your story.
The chances of you passing it on to your kids is extremely remote. It's really only through skin-to-skin contact with the infected areas that you could pass it on. According to ASHA (Amer. Social Health Assn.) there are no documented cases of getting herpes from an inanimate object like toilet seat, towel or bathtub. However when having an OB you might want to be cautious about sharing bath towels. It's probably not an issue but I've personally made sure I don't share towels when I'm having an OB, just to be on the safe side.
Often people like yourself (who've had it for years before suddenly getting symtoms) report a time of high stress or illness around the time when symptoms suddenly start happening. So it seems possible that the vascectomy might have triggered something. Another possibility is that you got genital HSV-1 through receiving oral sex. Do you know which type you tested positive for in the swab test? If it's HSV-1 it could explain the relatively minor symptoms, as well as the recent onset of it.
The main thing that will help prevent transmission to your wife is to avoid any skin-to-skin contact with your genital area while you're having an OB (plus and minus 2-3 days). Also, taking antivirals on a daily preventive basis will minimise the viral shedding that make you contagious. Viral shedding will typically happen at OB sites but that's not 100% guaranteed; it will, however, stay in the same general area (e.g., the "boxer shorts" area for genital herpes).
Using a condom is also typically recommended, but may not be helpful in your case because your OB area lies well outside the condom area. You and your wife need to talk about how she feels about the possibility that she could get it from you. There's no way to 100% guarantee you won't pass it on other than complete abstinence, including sexual touching. You can avoid sex during OBs and take the antivirals, which will greatly reduce the risk but there will still be a risk, as you well know. You and your wife need to talk about this, if you haven't already.
Also, if what you have is HSV-2 your wife should get blood tested (type-specific) to see if she already has it asymptomatically too. Not that I would wish it on her, but it could simplify your strategy considerably if she does since you two wouldn't need to be as cautious. I'm really glad this hasn't thrown your relationship into a tailspin. That will help both of you a lot in figuring out how to handle this.
If you live near a large population area, there may be a herpes support group in your area. It might help you get a handle on this by having others to talk to about it. Your doctor might know about this, or if there's a Planned Parenthood in your area they'd probably know.
Good luck! Keep us posted how you're doing.
TheOneInFour