If I'm having a bad day because I'm upset with people, I do something that might sound really loony. I'm not afraid of confronting people, but no one wants to do that and create problems all the time. So, if I'm really mad or sad because of what someone has done, I'll go off by myself and just have a conversation as if they were there. Generally, it's people I know well enough to know how they'll respond, and so I just tell "them" everything I would want to say to them. I'm able to get those things off of my chest. And, on the plus side, if I have to later confront them, I usually have it well in my head what I want to say.

If I'm just having a bad day because I wake up cranky, and the universe just keeps messing everything up for me, I'll do what I have to do (chores, school, work) and then just hang out and watch YouTube videos of people playing Zelda or something. Basically, I'm an adult and have to deal with my responsibilities, but once I'm taking my me time, I use that to recharge.