We tend to focus mainly on the PHYSICAL aspect of being healthy; however I KNOW that the MENTAL aspect is just as important.
Please try the following and let me know your thoughts:
Keep a 'mistake journal'. For each mistake you record, also include the lesson that came with it.
Stop worrying about things before they've happened. If they don't happen, you've worried for no reason; if they do happen, you've worried twice.
If you find that negative people are derailing your mood on a regular basis, take steps (get it, STEPS as in walk walk walk away:) to reduce their presence in your life.
Start practicing the above and realize the positive difference in your life!