Hallo.
i agree with the journal keeping. for me, to be honest, to took several years to find out, what was the cause.
for me its sugar, white sugar.
i am eating very healthy now..really, using only brown sugar, and snacking more on healthy staff.
keep the journal, because must be the food, that is the triger. and also stress....
i am migraine free...do get headaches sometimes, but not as bad as before.
wish you all the best
nadia