Yesterday I tried to save a fall by running out of it, and I got a little ahead of myself and hyper-extended my knee. At the time it was really painfull. Most of the pain was in the front of my knee right below my knee cap and it swelled up a little bit. Today I woke up really tight and now the tendens in the back of my knee hurt. What should I do to make this feel better as soon as I can? Stretch? Ice? Heat?