Just like a toddler tantrum, preventing a headache is easier and less stressful than trying to stop one. Research shows that a migraine attack often follows a stressful event or a rough day by about 48-72 hours. If you are prone to this nervous system stress response, what can you do to avoid headaches in the first place? How do you soften the symptoms once the pain has already started? Either way, you need to allow the nervous system to rest and reboot.