Attitude is everything. EVERYTHING. Changing the way you see or speak about things will completely turn your life around. I, and others, are witnessing this in my own healing process.
The nurses are always commenting on how positive me and my family are.
I enforce the positivity or "growth mindset" policy with myself and the people around me.
When my family first started to hear "bad news" I would hear how solemn they were on the phone. I told them to tell people I'm in good spirits, looking good, and am strong. This even made my family feel better overtime. We are laughing more, smiling more, and I'm feeling better.
On a personal note, I always talk to myself, tell myself can do something, I never down myself, and I always speak positively.