How do you handle having a bad practice session?

it usually wrecks my mood for a few hours; i pride myself on being good at stuff and when i try to play something, and the tuning is weird, or this pedal got nudged and sounds bad, or i try a new song and fuck it up, etc etc, it gives me a headache and feels bad. instead of the post-playing glow i feel wrung out.

how do you process this happening / refocus afterwards?