Hang in there... trust me...it ain't the end of the world.. I've had Lab's with seizure's.... Ended up putting them on either Phenobarb, or Sodium Bromine, and they all have very fruitfull, hunt filled live's. The first couple week's after they first start the treatment, thier kinda out of it, but it's just thier brain getting used to it.
Sorry your going through this, as I know first hand how horrible it is to see them go through this. Keep us posted on how your buddy doing.