I'm sure you will make the right decision no matter what. I know seeing a loved one have a seizure can be upsetting, but I have asked a couple of people I know who have seizures if they can remember them, and they have all said no. That's not to say no one remembers, but I haven't heard of anyone who does personally. Your cat probably doesn't remember them either. I had a dog who had seizures and lived many years with them. It was always distressing to see him that way. I know the helpless feeling, but take comfort that your cat probably doesn't remember. After seizures people and animals are usually pretty tired. Don't be surprised if he takes some extra naps.
Some people/animals seizure after very "exciting" times. If your cat likes eating, this could be an explanation. Other than that I can't think of anything else that would link a brain issue with eating. My dog's seizures were very unpredictable. At first the vet thought he had been poisoned, but all the tests came back negative. We never tested for tumors, but I don't think he had one.
I hope the best for your and your kitty.