When you are agonizing over MPB because you can't bring together your inner image of how you should look like with your actual physical appearance, going sly might be working like when you're rebooting your computer when it is stuck in some kind of loop, not working productively anymore. Or when you're suffering from ventricular fibrillation, using a defibrillator practically restarts your heart so it works properly again.
The initial shock of your first head shave might be such a needed reboot to your mind, giving you the chance to reconcile your inner and your outer image again.