Regardless of your physical condition, your present state is determined by your thoughts. Your emotional reality depends upon the focus of your mind.
Today, think of five places, either places you have already visited or would like to, that you can go to for mental vacations. Mentally go to a place where you will automatically experience the state you wish to be in.
Remember: Since we are dealing with your mind, no place is too far away. And the transportation costs are always free.
Sources: see Rabbi Yeruchem Levovitz – Daas Chochmah Umussar, vol. 2, pp.6-7