My dog, Christy that I grew up with had seizures for about the last 5 years of her life. They became more and more frequent with age. I know how you feel, you feel so helpless. According to the vet, they really aren't in pain or remember them. Even though Christy had epilepsy, she had a pretty healthy final years.

Christy (timber wolf-malmute) and Scooter (llapso alpso-poodle)