Caffeine...who needs it?

We spent the weekend in the New Forest visiting my mother-in-law. I managed on just normal tea on Saturday morning and a normal coffee Sunday mid morning when the first signs of a headache returned. Apart from sciatica that came on Friday night and which I don't think is connected, I've not had any other adverse effects. I have not had any caffeinated drinks since the coffee on Sunday so I think I've probably got this sorted now although I did fall asleep after lunch today. I simply could not keep my eyes open. My indigestion has improved since being off the caffeine so now I just need to get rid of this sciatica!