Home from book tour, back in the trenches

I am reduced to taking comfort from cliches.  This morning within a ten-minute period Jesse needed his basketball form filled out, Daniel needed lunch money, Fisseha needed an insurance card copied front and back for an upcoming overnight trip, Helen felt sick, it was my day to drive Lily's carpool, neither Daniel nor Yosef could find a jacket they liked, Daniel discovered he liked Fisseha's jacket, Fisseha protested, Daniel grew sad, Fisseha changed his mind, and Donny is out of town.  All this and more I handled, till the cat jumped onto the diningroom table in order to make eye-contact with me and then let out the meeow from hell. She was demanding food, and not kibble either, but an expensive small can of gourmet cat food of a particular recipe we are out of.  At this moment I remembered:  "What doesn't kill you makes you stronger."  Do I even have that correct?  Could one be killed by an assertive cat?  Could an assertive cat plus a printer jamming its paper rather than copying an insurance card lead to an early death? Am I stronger for having survived them? 

Yesterday the expression "A rolling stone gathers no moss" occured to me. I interpreted it to mean:  "Those who don't have many children won't, in middle and old age, have had many children."  Then I attempted to derive a bit of strength from that content.  Am I losing my mind?  Is there a cliche to cover this situation?