He's twitching his head and has one eye shut and is apathetic. He's 16.
It says that there's nothing really to be done in reading on the Internet but that they can recover. I don't really want to take him to the vet tonight as they won't do anything and it might distress him (he's insured, it's not money) - if I take him tomorrow they will only confirm a stroke with an MRI but it just says to keep him hydrated, there's no treatment apart from anti emetics - he's not sick though.
Anyone think I should do anything ? 
I'm just lying next to him right now, he's not purring and he always purrs next to me