Food. while I am not so strict on my food as genetic... it's important. You can change your habits slowly, gradually, one-by-one. Pick your vice and cut out the others.

support system is good thing to have.

life philosophy. And I don't mean "think of possitive things". I mean rather buddhist slash existentialist slash whatever will keep you going. There's not one way. For me healthy cynicism is way to go.
Remember that one of the top five regrets before dying is... being what others wanted you to be, not what you wanted to be... and don't let yourself be pushed. As long as you are not hurting others, you are fine (if your family moans and whines and cries how you hurt them because of "reputation", "what will people say" and other me-me-me sounding accusation... learn to let go).
Learn to live with your crazy. Expand your comfort zone. Learn to calm yourself down and nourish yourself.
Learn to channel your emotions in some way.