To start off i never had migraines but i used to have recurring headaches on a regular basis leaving me in (a not severe) pain for up to half a day since my youth. After a while i had a feeling it could have a relation to products i use or consume. After a little reading it seemed that some people can react badly to scented products. I stopped using and avoid hair gel, scented candles, scented air and car freshners, spray can deodorant and dishwash fluid for the dishes and cutlery. Since then i rarely have headaches and i feel (one of) those were there culprit.
Maybe unrelated but worth mentioning, i also have primary raynaud's phenomenon, which turns fingertips pale white and numb sometimes (bad bloodflow). Mostly in cold conditions.