I appreciate your thoroughness of explanation.
1) Is it possible to seroconvert further than 18 weeks, though unlikely?
Without taking any antiviral medicine, I have not seen anyone who is not positive at 16 weeks become positive at 18 weeks. Now given that the ELISA test misses 1-2 of 10 cases of HSV 1, this applies to western blot more than ELISA
2) Could these be something other than herpes, with these symptoms?
There is a condition called angular chelitis. Look it up. It is a type of fungal infection and it would not surprise me if after taking lots of antibiotics, you might see an overgrowth of fungal organisms. Just a possibility
3) If I had kissed another person (romantically; “making-out”) about two months after my initial “outbreaks,” and my 15 week test and 18 week test were results considered to be at “7” weeks and “10” weeks respectively, can I expect a dramatic jump in numbers for seroconversion if I was infected with HSV-1 and I tested again at “16” weeks?
You mean from the person with whom you were making out or from the original possible infection?