Peace itself is one of the greatest healing properties. Not only feeling the fact "everything is going to be just fine ". But the understanding that there is a solution to every problem. There is good vs evil. Right to every wrong or truly an opposing reaction to every negative situation. Everything can be alright.
Peace is freedom from disturbance; tranquility. It also means an end to war. When we "understand" that we can have this just by decision, we see just how easy it is to obtain. We truly never had to fight for it.
A mind that is stressed, overworked or "at war", actually causes several illnesses if you do not find peace. So self care of the mind is most crucial. Not only seeking a high vibration lifestyle but intentionally seeking peace with all that surrounds you. Even with the things you cannot change.
I read a great article that provides great tips on achieving peace of mind. One area I like is "visualization". Giving yourself something else to think about to induce that calm. Then meet the challenge with wisdom.