@Nrdsb4 I’m so so so sorry. It is so hard.
We had a dog that had grand Mal seizures starting around 10 years old. Terrible, so scary. Didn’t happen again for about 6 months. Then another 6 months. Then started more frequently. And she was having more physical trouble recovering from each one. The vet said: one time, she may not come out of it. So next seizure, she came out of it, and we had her put down. It was so awful. But at least she was with us, peaceful.
I wish you the very best to cope with your loss.