Do clients email you nice things? Compliments on a job well done, or encouraging feedback on a project? Try saving them for later. You are going to have horrible days in the future. We all are. Save those emails full of kudos in a special place, and when business tanks or life gets rough, give them all a quick read. They'll provide an extra boost to your confidence when you need it most, and potentially push you over the hump and into better days.
Save your kudos. You may need them later.