Recent Colon Cancer Surgery, what should my new lifestyle consist of to assure I stay healthy?

I had complications after the surgery. Gangrene in the belly button wound (laproscopic 3 openings) Now I have a protruding belly from the scar tissue and a huge fear of doctors and hospitals. I also have a complete prolapse and wear a pessary. I have bouts with diaharrea since the surgery as well. I want to get healthy and lead a normal life, I recently bought myself a WII and exercise on it every other day, I love it, and it makes me feel better. What kind of diet should I put myself on to assure I can stay healthy? Thank you so much

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