This may well have nothing to do with your situation, but I know that if I go more than 24 hours without a cup of coffee, I will get an 8 hour headache which won't go away no matter what headache pills I take, or no matter that I do then take a cup of coffee.
Lots of people discover this when they try to do something "healthy" like switching from coffee to tea or some other herbal or fruit juice drink.
Apparently one third of caffeine addicts suffer from this, and they just have to go cold turkey for six weeks of blinding headaches to overcome the issue. I found it easier to make sure I have a cup of coffee or a No Doze pill every 12 hours.
Regards,
Renato
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