Hi Bracken willowshimmer
I thought you were a new member because of your name and then I looked up and found your post with change of name! Anyway I think it's an amazing name and conjures up the wild wet uplands!
Re the headache. I started getting really bad pre-menstrual headaches in the years leading up to menopause although I had no idea I was peri-menopausal because periods were still regular. I realise now they were classic migraines. I continued to get them when I started HRT - during the progesterone withdrawal phase, and sometimes while I was actually taking the progesterone. I get them now only occasionally (thank goodness) - triggers can be progesterone, alcohol especially wine late evening or the progesterone withdrawal, or sometime nothing at all it seems.
My husband kept saying I should go to the doctor because the pain was so strange (but I never did). It always started with acute sound aversion, and then light aversion and then the headache along with exhuastion and nausea, which would go on for 3 days always - whatever I took (well I don't take anything stronger than Ibuprofen as not keen on and have never taken heavy duty painkillers). You mention the precise place of most of the pain - this always happens to me when I get them - usually a very tender place on the upper right of the top of the head which hurts to the touch- just like you say (as well as neck). Very strange. Then it all goes, the exhaustion lifts and I'm fine.
I never had mine diagnosed by the doctor as migraine but that is definitely what they are having looked up the symptoms.
Some HRT could give headaches - especially the progestogens, or a sudden increase in oestrogen could give this temporarily - but not just before a period. On the other hand if it is pre-menstrual it could just be the progesterone withdrawal - ie from your own as well as the added progestogen.
Sorry I don't know anything about sertraline...
Hope it improves because I know just how debilitating these headaches can be, especially when you have to do stuff like work (sometimes I have to go to bed with them but not often).
Hurdity x