You're already doing what you need to do, keeping him calm and safe. There's another thread on the board that deals with seizures and there is a lot of good advice on them, so I would search the board for seizures. In the meantime, since his seizures are every few months they more than likely wouldn't put him on any meds anyway, they usually only do that if the dog is seizing at least once a month. But keep a diary, write them on your calendar, keep track of how long they last. It feels like forever but it's really only ends up being like 30-60sec!! If they get more frequent or last longer then it's time to take him to the vet and rule out other things. Navarre's would be so violent sometimes that he would actually flip over! So when he was having one, if I was home, I would sit behind him, do not put yourself anywhere near their face!! Keep him out of doorways, from under furniture, etc so he doesn't bang his legs on anything. I don't know if Clyde has a pre-seizure personality. I could sometimes tell when Navarre was going to have one, even a day or so before, so I would start putting him in his crate when I wasn't home just in case! And after the seizure just reassure him he's ok and get him back into his routine.
If you have him on a food that has wheat, try to find one without. In people with epilepsy they have found that if wheat is removed from the diet, the seizures get fewer and less severe. Just know that if there is no underlying cause, and it doesn't sound like it, nothing will make him totally stop having seizures. They will get less often and less violent. Navarre started with having seizures every 2-3weeks but at one point he went 10 months without one! Good luck!
