Yea, we know, we mentioned this one already but drinking water while you’re out boogying and a bit when you get back will help to make sure you stay hydrated.
The main reason you get headaches is because you don’t have enough water in your system; the other organs in your body will steal supply from your brain causing it to shrink and cause owwies and upsets in your head.
Anyway, what’s the point of making sure you’re hydrated beforehand if you’re only going to throw it all away later?