i would wager you’re missing electrolytes. that’s what it is when i feel that way. i will grab some gatorade or other sports drink (get the one with sugar unless you have diabetes), mix it with an equal part water because deer gods it is too sugary, then add a one-fingered pinch (something like a quarter teaspoon, but it doesn’t have to be precise) of table salt. not enough to make it taste salty. more salt than it already has. i drink that when i’m dehydrated. it’s the about the right salinity to absorb fast, and the sports drink bullshit makes it not taste horrible.