What I do is fairly situational. But for anger, I usually just convince myself that what happened is in the past and I can't help it, then I go listen to some Beatles and/or play video games. Any game will do, as long as it's enjoyable and preferably laid-back in nature. Depression's a toughie, but I just go to one of a few close friends who know me really well and just talk, about anything. Eventually things start to make sense and then it just takes one little good thing to happen to get back on my feet. Anxiety is one I personally never really have a problem with. It's part of my life philosophy, that I do what I can do using what I've been given and what I've added, and nothing more. Whatever happens, happens, and while it wasn't necessarily predetermined, it's what was supposed to happen. Whenever I have days where I'm just feeling off, no emotion I can attach to the feeling just like something's not right, I sit down, take some alone time, listening to whatever music catches my fancy and play some CS, CoD, something like that to get my mind back in the right place.