Despite my reply to drop bear, also going to recommend RICE. You should also go to the ER, you should go anytime you hit rusty metal just to be safe (tetanus).
Outside of that, I want to check something. You go to a condemned house, which likely means its not that stable. You then realize there's nothing to do in that house, so you decide to punch the walls (of the unstable house you are currently standing in), breaking down its foundation. You hit a metal stud, have your hand hurt for 2 weeks, and still don't want to get it checked out, simply because your in the hospital a lot. I'm noticing some logical issues in just about every sentence there. Do you not notice them, or do you see them and just not care about them? If it's the first, then listen to the other posters. If it's the second, continue doing what you're doing.