I think a behaviourist is definitely the way forward - as this will provide you with some answers and a plan of action.
Seizures come in
many different forms ... some are the typical grand mal
epileptic fit ... but others are known as petit-mal, minor seizures that some owners don't even see happening. They can cause a dozy, drunken like state, or an animal can seem "lost" for a few minutes, as if he doesn't quite know where he is, who you are or what's happening to him.