It's obvious though something is going on with his head
What type of tests are they doing? Sorry I forgot.
I also forgot what medicine you said he was given. I'm sure its similar to phenobarbital and I hated Behr being on it. He slept all the time and had no energy or motivation when he wasn't just laying around.
I might suggest looking at some info on canine idiopathic epilepsy. There is some good information about it that might help you understand and be able to question your vet better.