It may be worthwhile to ask your vet for a referral to a neurologist. Of course, it'll probably cost a bundle of money for testing, and you're still left fiddling around with meds to control the seizures. It's really a tough call.
Your vet is right that these episodes are far more painful for those watching than the one having them. Actually, I shouldn't say "painful" because pain isn't involved - although it may look that way. All you can do is make sure he doesn't bash into something that will physically hurt him and wait it out.
My neighbor's 120-lb Lab has seizures every 8 weeks - down from every week a couple of years ago. He takes phenobarb twice a day, with an extra one shortly after a seizure occurs. With meds, the episodes are farther apart and less severe. In the beginning he would lose bowel and bladder control. He always starts spinning to the right when it happens so his owner has to bulldog him so he doesn't bash himself into the walls, trees, furniture - whatever. You can imagine doing so while the dog loses control of his bowels. Not pretty for either one of them.
Thanks for the advice ! Everytime Calvin has a seizure - I get on the floor with him and hold him. I'm not sure he even knows I am there ... The vet tells me its more painful for me, than it is Calvin during the seizure - and I just hope thats true.
My boyfriend's grandmother had a dog that had seizures. The best thing that she did for the dog was to hold it and make sure the dog couldn't hurt itself. Just make sure the dog is in a safe area where it can't get hurt and wait them out. Talk to the vet if they cause any type of damage to the dog but there is really nothing more you can do. I'm sorry I'm not that helpful.