Put your foldable flats back in your bag: A night in heels shouldn’t mean you have to hobble home. Before going out, tape your third and fourth toes together using nude or clear medical tape (the flexible kind). This helps take pressure off the ball of the foot. (A bit of biology for those who are interested: There’s a nerve right between these two toes, and the tape minimizes any strain.)
Keep silica gel packets in your shoes when they’re not being worn. Have you noticed after purchasing a pair of new shoes those little white packets containing tiny clear balls inside your shoe box? Those packets contain silica gel which absorb moisture and keep your shoes from shrinking. Hold on to those packets instead of throwing them away and stick them in your shoes when you’re not wearing them. You can ask a shoe store associate for extras, if necessary.