Famciclovir and valacyclovir are quite similar in potency and their antiviral specturm, so if you did not obtain benefit from the former it is unlikely you will do from the latter.
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Antiviral Drugs for Herpes Family Viruses
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Valtrex (valacyclovir) · · · EBV, VZV, HSV-1, HSV-2
Famvir (famciclovir) · · · · EBV, VZV, HSV-1, HSV-2
Valcyte (valganciclovir) · · EBV, HHV-6, CMV, VZV, HSV-1, HSV-2
Vistide (cidofovir)· · · · · EBV, HHV-6, CMV, VZV, HSV-1, HSV-2
Falcigo (artesunate) · · · · EBV, HHV-6, CMV, HSV-1
Nexavir· · · · · · · · · · · EBV, HHV-6
Foscavir (foscarnet) · · · · HHV-6, CMV, HSV-1, HSV-2
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