If you haven't eaten properly for a few days then fits like these are quite common, especially if you're going on as normal.

I had something very similar for all of last year. We ruled out diabetes, mini-strokes, MS, antiphospholipid syndrome and a few other strange (and scary) things only to find out that it's a strange form of migraine. Infections generally make underlying conditions a bit worse too, so that's why it was probably a lot more violent than it should have been.

I'm sure the doctors will keep an eye on him and check everything out - just remember to ask what they're looking for every time you see them, as test results usually mean they stop looking at one thing and start looking at another.

Best of luck and I hope it's just infection and no food doing this to your DH and now he has learnt his lesson.