Buy caffiene pills (Caffiene only nodoz or equivalent) and wean yourself off by lowering your dosage down over a few weeks (“titrate yourself off”). Breaking the pills into smaller amounts during the last week is annoying, but the technique prevents headaches and other symptoms.

And beware that some bags of coffee beans have residual amounts of pesticides/fungicides etcetera which is possibly a cause of your problem. I sometimes get a mild allergic reaction to a coffee supplier, so I have to change suppliers until I find one I am not allergic to. I am pretty sure it is pesticides or another treatment... I am a fairly scientific person who loathes unscientific hypochondriacs: I have reasons to believe it is something in the beans and prior experiences suggest a treatment product.