The happy people maybe found good doctors that try to support their position and give them good care. The sad people probably never found a good doctor. I've also noticed that the happy people follow the doctors orders and follow through with physical therapy. The sad people say everything is a waste of time and try to find a magic pill to take it all away.
I am not saying I am one or the other. Frankly I feel I am somewhere in the middle. I have bad days and I have really good days. I just notice this trend of people being either always on the up or always on the down. I feel bad for the ones always down. I don't ever want to get to that, where I just see no light at the end of the tunnel. I want to always be happy. I just don't know the secret.