I'd agree with all that's been said before, but it's probably still worth a chat with your GP. Your meter will corroborate your readings, I hope. He may be able to write a letter, or you may be able to write a factual report of the circumstances, which he may be able to confirm is a credible account of events, and how things might have gone (befuddled rationale/extreme fatigue/disorientation) based on your readings.
It's a longer shot, but you have little to lose in asking.