Did you have any urine testing done? There is a condition called NGU, which is non-gonococcal urethritis. It means any infection in the urethra that isn't gonorrhea. If you had elevated white blood cells in your urine, you may have had NGU.
That your symptoms were relieved by Levofloxacin suggests that maybe you had a bacteria causing NGU. It can be caused by a bacteria in the mouth entering your urethra, or other bacteria in the genital tract. Strep, normal mouth bacteria, E. coli, ureaplasma, mycoplasma genitalium (this is a newer STD that many still don't test for), among many others.
I would believe this happened above it being herpetic urethritis.
If you get another herpes test, skip the IgM. It's highly unreliable, and should be used anymore.