Go for a run, hike, mountain bike etc. I live in an outdoor paradise so this is what works for me. Examine what went wrong, why you did what you did and try to learn from your errors.
The best thing to do after a big loss or a big win is just to trade normal. Market does not change just because you lost big money. If this is too hard for you to do, then second best is just to take few days off and then trade as normal. Market is always there, and it doesn't change just because of you.
Smoke some good weed, get nice and relaxed. Then the next day trade 3x your normal size on a good setup.
PJ Clarke's for happy hour, an 8-ball, the Palm Too, and the Hustler Club. When you are done, go home and call an escort. Before Happy Hour, go over your journal for the day and find your mistake. Think of being on the other side of whatever trade it was and imagine how happy you'd be with that execution. Remember someone out there is laughing at you. Nothing like humiliation to get you motivated. Do your reasearch for the next day and then start with a double scotch.