Yikes!!!! Guess you'll think twice before laughing at someone's terrible luck next time, huh? Hopefully you learned a powerful lesson ;-)
To change your luck you need to start with smudging (wafting smoke over) yourself and your home with a bundle of sage. Make sure you start at the very bottom of your home and work your way to the very top. As for smudging yourself, you'll want to start at your feet and carefully move to the top of your head.
Immediately after smudging, you'll want to sit down visualize (see/sense/feel/know) all the "bad luck" moving away from you. See the "dark cloud" leaving your body and dissipating harmlessly away from you.
Lastly, you'll want to pray to whatever Divine you recognize and ask them to grant you positive luck/energy.