While I doubt that it is happening, I worry that you might have
canker sores which are masquerading as herpes. If that were the case, it would be good news since
canker sores are not infectious,
If I were you I would not be concerned about continuing to take the valacyclovir- it is among the safest drugs we have and as long as you don't have severe kidney disease (as in needing dialysis) you do not need to worry.