Take Sensory Care
The normal defenses a well person has against visual, auditory, olfactory, and other kinds of clutter are pretty defeated when you're sick. Your energies are consumed with getting better, not filtering out. This makes it all the more important to be in a tidy, clean space that smells pleasant (or at least clean), sounds peaceful, and looks nice. Even if you can't control all of those things, do what you can with your immediate little sick nest--toss the tissues, make the bed (even if you're in it), put the dishes away, wipe the table down, etc.