I am thinking it is possible your high HSV titers might be due to constant reactivation of the virus from latency, rather than any significant ongoing systemic infection, which COX-2 inhibitors might help prevent.
This is a very interesting proposition. PCR tests and IgM for all herpes viruses were always negative in several tests over the past year. I also didn't have any cold sores for years. That's why my docs also said there is no active infection. Perhaps the HSV-1 constantly tries to multiply but can't because of the high antibodies, but the immune response is producing inflammation and other symptoms.
But it would still be unclear why the high-dose anti-herpetic drugs didn't help control much in controlling the reactivation. Valacyclovir and Brivudine are both highly active against HSV-1. But that seems possible, the study you posted says "[HSV-1] breakthrough reactivation can occur despite suppressive antiviral therapy."
I will look into glutamine and Celecoxib. Happy to see both are available and inexpensive in Germany.