I mean like a physical sensation of being able to stretch the corners of your mouth sideways, but not upwards? Feeling like your face is kind of sagging/hanging and your muscles can't really counter it?

Not as severe as in facial paralysis, but noticeable. I read somewhere that cortisol (the stress hormone) can compromise your collagen, which is what tones all kinds of tissue, but no idea if there's a relation.

I would love to learn if there is a possible connection, or just hear your experience. Did your face eventually recover?