I think it just smooths out the ups and downs; birth control pills made mine so much worse, I didn’t realize it until I had to stop them, and it made me very wary of the HRT but it is the opposite effect somehow. Anti anxiety probably same, the main trigger I have now is relaxation - if I am busy or stressed, then it eases, I will wake up with a headache. So I’d imagine if the stress itself is interrupted and the intense relaxation also, that would help.