To avoid aggravating a migraine, stay away from bright sun with hats, sunglasses (even in the house, yup!) and close shutters. Put up a Migraine in Progress sign to remind others to reduce volume and stress.
Homemade "magic swizzle/mouthwash"! Equal parts liquid benadryl (antihistamine) and liquid maalox (chalky antacid). If I feel the swelling and soreness coming on after eating/drinking I rinse with this before bed, in the morning or after eating as needed.