I had a very similar episode in March. I'd been feeling dizzy, and almost blacked out, so I went to lie down, and when my mum came in to talk to me, I couldn't speak. My right side was also numb. I was rushed to hospital as a suspected stroke. Freaked the hell out of us all, but in the end, they decided it was a migraine, as I improved gradually, and with a stroke, they don't really expect an improvement. I was told to take aspirin when I start feeling dizzy to knock it on its head, and then the GP also prescribed maxalon. I've since had 2 further episodes, but the maxalon and aspirin does work and stops it developing any further. I tend to feel dizzy for anothe rhalf hour and then just groggy for a few hours. Definately go and speak to your gp about tho as pp have suggested. I did get a pretty good explanation from the hospital doctors but it helped to talk to someone else too after it had all died down.

I can't help you with the sugars, but maybe it did cause the migraine? I'm not entirely sure what caused mine, but I think it might be the combination of coffee and chocolate (I don't think its the caffeine, but a chemical thing).