Because HSV-2 is a neurotropic virus--i.e., it sets up housekeeping in neural tissues--it is logical that it might cause neuropathic pain syndromes, which is what your symptoms sound like they could be. It doesn't happen often and actually isn't very well documented in the medical literature, but I suspect it is real. However, I have never heard of fasciculations (for other readers, that's muscle twitching) due to herpes. I can't comment on your neurologist's diagnosis of stress--but if you're not convinced, consider getting the opinion of a second neurologist; or see if there is an infectious diseases specialist in your community, or someone else who is expert in herpes infections.
You undoubtedly were given the large dose of valacyclovir (Valtrex) because your provider initially suspected shingles, which requires much higher doses than HSV infections. As you may know, 1 gram (1000 mg) once daily is plenty for genital herpes, or 500 mg twice daily. Even the large dose you received rarely causes nausea or other side effects, but definitely the lower dose won't do so. Don't be afraid to try suppressive therapy in the right dose.
Good luck-- HHH, MD