Dale Carnegie offers the following three rules for dealing with worry in his book How to Stop Worrying and Start Living. Content adapted.
If you want to avoid worry, then follow the example of Sir William Osler and live in ‘day-tight compartments.’ Don’t stew about the past or the future. Just live each day until bedtime.
The next time worry backs you into a corner, try the approach of Willis H. Carrier.
a) Ask yourself, “What is the worst that can possibly happen if I can’t solve my problem?”
b) Prepare yourself mentally to accept the worst, if necessary
c) Then calmly try to mitigate the worst that you have now mentally accepted as possible
Remind yourself of the great price your health pays for constant worry in your life. Be diligent to excise worry from your day-to-day life so as to avoid the wear and tear on the body.