Same here. It almost disappeared completey after I started to drink energy drinks with lots of carbs. I used to sweat out way too much.
Nutrition was the cause in my case as well, but not yesterday. I was well fed and well hydrated so that can't be it. Probably just stress, it wasn't a major migraine anyway. I was still able to workout, and even spar so it was just minor. And the worst part was in my sleep, I just woke up in the aftermath, you know how it feels.
Fri Jan 30 3x3 shadowboxing 3.9 mile run (sideways, backwards, doing carioca's, etc) 10 mile bike ride 3x3 shadowboxing
Sat Jan 31 20 minutes warming up 1.5 hour various pad / glove drills 10 minutes bag drill 10 minutes cooling down 14 mile bike ride
Sun Feb 1 4 miles run in a nearby park 3x35 pushups 3x50 crunches 3x20 squats 3x20 dips 3x3 minutes shadowboxing 5 minutes stretching 10 mile bike ride
Mon Feb 2 5 mile bike ride 30 minutes warming up 1 hour pad / glove drills 3x3 light sparring 15 minutes cooling down 5 mile bike ride
It's getting there. My condition is okay, but what matters of course is how I do in sparring. The problem there is that I'm a slow starter. I think I need to have a round or two of light sparring before my match, I wake up after I've been hit. I feel strong and fit I just wish it was summer. I feel like swimming, canoeing, biking, surfing, **** like that. But it's cold and miserable.
Tue Feb 3 30 minutes warming up 1 hour pad / glove drills (stepping in with jabs and straight rights) 2x3 light sparring with beginners 10x2 sparring with a welter and a light middle 10 minutes cooling down
Wed Feb 4 5 mile bike ride 15 minutes warming up 1x3 shadowboxing 4x3 heavy bag 10x3 sparring against a southpaw 1x3 shadowboxing 10 minutes cooling down / stretching 5 mile bike ride
Thu Feb 5 5 mile bike ride 30 minutes warming up 3x3 bag work 5x3 extremely light sparring with two girls 10x3 sparring with rotating opponents 1x3 bag work 1x3 shadowboxing 10 minutes cooling down 5 mile bike ride I'm half dead now and my arms hurt, I think I'll rest tomorrow.