You will keep in poerfect peace those whose minds are steadfast, because they trust in you. ~Isaiah 26:3
A steadfast mind is crucial, because whatever gets your attention gets you. Your life will flourish if you simply stop focusing on what you don't want and start focusing on what you do want. Stop focusing on what is bad for you and start focusing on what is good for you. Stop focusing on what everybody else wants you to do and start focusing on what God wants you to do.
No matter what handicap you have, you can be healthier than you are right now. But there are choices to make. Choose to do thinks that invrease your energy. Choose to do things taht lower your stress and bring more power and more health to your life. Eat better. Get more sleep. Priortize what's importantr. Be steadfast in every choice and trust God with the results.