Easier said than done, of course...

“The secret of health for both mind and body is not to mourn for the past, worry about the future, or anticipate troubles, but to live in the present moment wisely and earnestly.”


― Buddha
 
This attitude of staying in the NOW is something that I am not very good at.  Fortunately, DH is a an adept!  Perhaps that is why he remains relatively healthy even in the face of a terminal disease.