Meditations 9:41

Epicurus: "During my illness, my conversations were not about my physical state; I did not waste my visitors' time with things of that sort, but went on discussing philosophy, and concentrated on one point in particular: how the mind can participate in the sensations of the body and yet maintain its serenity, and focus on its own well—being. Nor did I let my doctors strut about like grandees. I went on living my life the way it should be lived."

Like that. In illness—or any other situation.

Not to let go of philosophy, no matter what happens; not to bandy words with crackpots and philistines—good rules for any philosopher.

Concentrate on what you're doing, and what you're doing it with.