Our member has helped you as best they can at this point. Please work with your doctor and we wish you the best.
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Sex could trigger it, stress could, another illness could, fatigue, sometimes you never know what triggers it, and you'll hurt your head trying to figure it out. I don't get a lot of hsv2 outbreaks, but I'd guess maybe half, I have no idea what triggered them. I no longer try to figure it out.
If you are convinced you didn't notice an hsv2 outbreak, it would stand to reason you didn't notice a ghsv1 outbreak, which are usually much milder, and this is far more likely given you are testing negative for hsv2.
In any case, you need to find a way to treat this. A neurologist can help. If ghsv1 did cause this, it's called post-herpetic neuralgia, and be prepared to defend it to a doctor, because while it happens a lot with shingles, it's not that common with herpes.
This doesn't sound like herpes. You wouldn't have the nerve pain without having an actual outbreak.
Genital hsv2 wouldn't cause sharp head pain, either.
Since you are having pain in your testicles while sitting, and pain in your shaft, has your doctor suggested a prostate exam? Those can be symptoms of prostatitis.
Have you had other STD tests done, like gonorrhea, chlamydia and NGU?