Hello CarryWarry and welcome to the forum.
Unfortunately I can't be of help to you but I wonder if my experiences would be of interest. Earlier in my menopause journey I experienced daily headaches that nothing would shift. Weirdly at about 9 pm the headache would disappear and I would feel much better however I would wake with it again the next morning. My mother died of a brain tumour so you would think that I would've been extremely concerned and sought medical help but I wasn't particularly worried and assumed it was another meno symptom. This situation continued for six months and then the headaches just went, never to return. This all occurred five years ago a few years after my final period but before I began HRT and was unusual because I had never been prone to headaches when menstruating.
I can see how worrying and distressing this symptom can be and you have my sympathy. If I knew exactly why they started or, more importantly why they suddenly stopped I would let you know, I am however convinced that they were due entirely to the menopause.
Take care and I wish you luck with your treatment.
K.