Aching head

I'm not sure what happened, but I ran out of energy yesterday. I discovered last weekend (via the canteen soup) that large doses of monosodium glutamate at the wrong times create an up (high for half a day) then down (low for a day) effect; I'm not sure if this is still a part of that, msg in wednesday's lunchtime buffet or just overstressing or overdoing it a bit on the exercise, but it was very very difficult to cycle home yesterday. So I got home, ate, fell asleep, and woke up this morning with the biggest migraine since my teens... a full-works, turn-the-world-down, flashing-lights, 3 sets-of-Migralieve monster of a migraine. I think I'll keep an eye on it. Or drink more beer so I have a better excuse for it happening.