What do you do on your bad days?

What do you do on your bad days? Pretty sure we all have this. it’s a like a spidey sense telling us this is a bad moment. Do you push through or sit it out? Like if you’ve been meaning to get a haircut but can feel it’s a bad day, do you still go or do you go the next day? Also, do you have any ways to reset your brain when you’re having one of those days?