Been on a l-o-ng walk this morning, was aiming for an hour but my sense of direction is useless, so it was two hours. The dog and I are lying in a heap now.

I feel great really buzzy, apart from a headache. Now, I'm not complaining, I'm just still trying to get the hang of my body, trying to understand it.

I was hydrated when I went out.
When I got back I had 10 fl oz of water and then another 10.
I ate some protein and some carbs.

About 2 hours on now, I've got the headache, not something I usually get. So I just wondered: could I be dehydrated still? Or have I released some somethings or hey, what might it be?

Like I say, if it gets bad enough I'll take a tablet, it ain't no problem. I just want to know more.
Thankyou!

There could be a number of reasons and many of them not related the exercise itself. Was it a warm day? Did you not have any caffiene today? Were you dehydrated before the exercise?

I guess if this happens frequently after exercise then I would be concerned but in the meantime treat it as a normal headache and take medication if you feel you should.

Good on you for such a long walk though

You mention that you ate afterwards, but did you eat enough before leaving for your walk... Let's say you ate an hour before you left, then walked for 2 hours, that is 3 full hours without food. It may have been too late to prevent the headache by the time you got home eventhough you ate and rehydrated asap. Just take a pill and relax a bit... Congrats on your walk you burned a ton of calories

I get headaches after the treadmill and have bee wondering the same thing... I'll def. keep water on hand to make sure that Im no getting dehydrated

Are you congested? Congestion gives me a worse headache when I exercise. Just a thought.

Was the sun out? Exercising in the sun can give you a headache if you aren't wearing a hat. Especially if you were out walking in the sun for two hours, enough so that you felt fatigued when you finished.