I'm back and I actually have very good news. Though, illogically enough, even the good news has me feeling frustrated and rather embarrassed.
After ten days on the seizure ward, the doctors finally decided that I don't have epilepsy but a combination of very strange and severe migraine headaches, and bad reaction to the anti-convulsant drugs I'd been put on. I'd been taking these medications for years! I've been referred to a different specialist for the migraines, don't know when/what to expect though.
Thanks to everyone who wished me luck, and wished me well.