I think one very important thing if you get injured is staying hydrated. I have never had a bad cut or injury in the wilderness but I have had a few bad cuts. Different people will react differently to these things but I have found that if I get a pretty bad cut my body will got into survival mode and pull all of my blood to my core leaving me lightheaded. I know some people will drink water at a stream and then walk to the next stream without any and get some there. I dont do this because having water at a moments notice can prevent a poor situation turning to a serious one.
Moral of the story, always stay hydrated and have water with you.