How To Reduce Swelling And Tightness In The Knee?

i came down from a jump on a trampoline and my knee felt like it gave out on me. I continued to jump but couldn't really jump from side to side at all. It's been 5 days now and after some swelling and tightness in it, it still hurts and seems to pop and give out on the outside of my knee. I feel like I would be unable to jog or run on it at all. Should I get it checked out?