I was lucky enough not to face any required summer reading lists until I went to college. So I still think of summer as the best time to read for fun.
Turn resolutely to work, to recreation, or in any case to physical exercise till you are so tired you can't help going to sleep, and when you wake up you won't want to worry.
Stop a minute, right where you are. Relax your shoulders, shake your head and spine like a dog shaking off cold water. Tell that imperious voice in your head to be still.