Got one.

Started around 4 am last night.

Searched the all-knowing web -- "Caffeine withdrawal is often characterized by a headache, fatigue, feeling less alert, less energetic and experiencing difficulty concentrating."

And didn't I just miss a morning dentist appointment -- got confused on the time.

And I am tired.

Of course, I could just be old and it could be just a brain tumour.

Never missed a dentist appointment in my life.

It all started when I ran out of tea yesterday, but found an unopened package of decaf tea in the cupboard.

I switched from coffee to tea (with the occasional weekend double decaf expresso) earlier this year, but have been drinking regular Earl Grey tea (hot . . .).

Less caffeine in tea than coffee, but still.

Now I'm off to the store for some more tasty tea.

More on caffeine and health here.