Reading this thread has made me realise that I am not going mad! I suffer hugely with my mental health, episodes of dissociation and anxiety being a key one. However, I have tried and tested strategies for those.
In contrast, every now and then I will start to feel disconnected, but (unusually for me) not anxious at all (disconnected feeling usually makes me very panicky) and want salty things; then the headache comes. If I have coke, aspirin and can sleep for a couple of hours with a heat pad on my neck and tiger balm my forehead, I can sometimes shake it. But for up to a week after, I feel very low, extremely anxious, exhausted, and like there is a lag when I speak or even turn my head. Trying to do computer work during this time can bring the headache back and it also feels like me eyes aren’t working together (even though tested very recently). I definitely don’t feel safe to drive. Funnily, I’ve found that if I get diarrhea (I sometimes do), symptoms can dramatically improve, to the point I have considered taking laxatives!
I had been despairing as even taking diazepam - my mental health last resort, which is usual spectacularly effective when my anxiety is awful - has had no effect on the dissociative anxiety symptoms after the headache. I thought I had developed some horrible new dissociative disorder, inner ear problem or was getting a mystery virus once a month.
I can’t take triptans, I don’t think, because I’m on antidepressants, but coke, aspirin, tiger balm, a hot water bottle, a nap and salty crisps work very well if I act fast enough.
I’ve noticed they tend to come on if I’ve had an intensely busy time and then suddenly stop. A Friday night headache after a week with a big work deadline is quite a standard pattern, I’ve started to notice.