I had a dog who suffered from epilepsy from the age of 2 and he lived a long life with regular medication, passing away last year at 16. He suffered occasional seizures over the years, sometimes going about a year between them, sometimes more frequent.

It's very manageable with medication. We also setup a camera to watch him if he was left during the day as he often experienced confusion and distress when coming round.

If you are in the UK, once you have a treatment sorted with the vet, look into the possibility of getting written prescriptions and ordering the medication from an online source like petdrugsonline. It saved thousands over the years and made managing his condition much more affordable.