Here’s advice on a “Helpful Hints” page in a hundred-year-old church cookbook for how to cure a nervous headache:
To cure a nervous headache use two or three slices of lemon in a cup of strong tea.
Cement City Cook Book (1922) published by the First Baptist Church, Alpena, Michigan
A Hundred Years Ago 
Wouldn’t work for me!
That sounds good any time. I think just sitting down to sip a cup of tea helps.
Well I drink plenty of tea , will try adding some lemon next time, guess it’s kinda soothing.
I do not know what a nervous headache is!
I don’t think I’ve ever had a “nervous” headache!
Stress Headache I think we might call it now and this sounds like a little self-care that could just help.
Works for me
I think we call them “tension headaches” now, but slowing down with a cup of tea with or without lemon helps ease tension.
I have learned to eliminate the problem then drink the tea as a reward. 😆