Jerry Weinberg, who died yesterday, used to say that every time you hear the j-word ("just") you should replace it with "have trouble", i.e. "you could also have trouble avoiding your migraine trigger". He was talking about software projects, but the rule is general. The j-word usually indicates that difficulty is being glossed over.
What if something common like changes in atmospheric pressure trigger it? What if you have multiple common triggers? What if you don't know all your triggers?
Then you can hook up all the data into a recurrent neural network that finds the patterns in the data and lets you know what combination of conditions will give you migraines.
It's really easy to find all your migraine triggers if you follow these very basic steps.
This is my experience too. I know a good number of my migraine triggers, but some days I do everything right: I eat good food (regularly), plenty of sleep, no over-exertion, lots of water, breaks from screen time, no eye strain, etc etc...still get a fucking migraine!
Sometimes there's just not a reason for it.
Also, might be helpful to just download your consciousness into a synthetic brain
Honestly, I've long dismissed the claimed benefits of ketogenic diets like 'reduced inflamation' as... minor and uninteresting. A few weeks into a low-carb diet for my migraines and my sedentary butt is suddenly running and with my untrained knees never having felt better. I would not be shocked if there were other beneficial effects of ketosis on migraines.