I'm in the same boat as you. I had sex with a girl and had a tingling sensation in my urethra about a week later, but I had protected sex so I didn't know what to think. I went to see a doc and they prescribed doxycycline which made it go away for about two weeks. This was almost six months ago. I have been in and out of the doc with unusual symptoms for which I cannot pinpoint a disease (testicular pain, leg pain, joint pain, abdominal pain, but no fever ever and headaches few and far between). I live in Wisconsin and am concerned this could be lymes disease as it is more common here. Did medication for limes disease work for you? Do you think your testicular pain was a function of lymes disease? I also am concerned re: herpes although never had an outbreak, but have had nerve symptoms which can also be affected by lymes disease. My doc doesn't know what to think and I feel stranded on an island of confusion as my body is riddled with pain.
I would say that your symptoms are not consistent with herpes. Herpes symptoms do not occur constantly, as your does. They are usually intermittent. It would not cause testicular pain, and masturbation or ejaculation would not make herpes symptoms worse.
Have you considered asking the girl to get tested? That might be the easier/quickest way to sort this out.
If you have testing, you should get IgG only, and it is best to wait 12-16 weeks after the exposure.
You've been properly treated for any bacterial infection with the doxycycline.
Terri