Enema. First line of defense... a crashing 12 hour headache is a sign major detox happening. Flush that crap on out!!!
But I personally having survived some doozies... do the enema in an Epsom Salts bath. Let the water hold you.. and do the really, really forbidden. FEEL the pain.
Yup, lie there all wet, warm and close your eyes and stop resisting and pushing
the headache away.. just feel the pulsing, notice as it moves from the front to the back, around the ears.. above the neck, back to the temples.. deep in the center of your head.. behind the eyes. Just feel it awhile. And then rest, if you can.
I am going to send you white light and healing thoughts. AKA prayers... grin