I'm not going to be able to help much. But fortunately, it sounds like you are now seeing a doctor who knows something about STDs (not that the first ones didn't). The idea of HSV sounds like a fair possibility, given your symptoms--but you'll have to await the test results.
Another possibility is that your initial urethral pain was due to an irritation, not an infection, associated with the sexual encounter you describe. In particular, if the condom contained the spermicide nonoxynol-9, that may be the only problem; N-9 can cause significant urethral irritation and pain. Onset in under 24 hr ("the next day") is more suggestive of something like this than like an STD; with rare exceptions, no STD causes symptoms that fast.
Perhaps most important, the treatments you have had were more than adequate to eradiacate any STD. So apart from the possibility of herpes, you can be 100% confident you don't have anything you can transmit to your wife. So for now, try the valtrex and see if it controls your symptoms, and wait for the HSV blood test results. It's a little early to be positive at 18 days, though, despite what the doctor said. If your symptoms don't clear up on Valtrex, you can be certain it isn't herpes. If they do and the initial (18 day) blood test is negative, get retested after 6-8 weeks.
Bottom line: If herpes doesn't pan out, you can safely have sex with your wife without putting her at risk. Even if your symptoms persist, it doesn't necessarily mean an ongoing infection. An immunologic/irratative reaction, or anxiety (or a combination of both) could be the only problem now, regardless of what started it off.
Good luck-- HHH, MD
HHH, MD