I went cold turkey (anyone else wonder where the heck that phrase came from?) and had a headache for a freakin' week. Mine was doctor suggested, and I have to say I sleep much better now. Used to be the slightest noise would have me wide awake, but now I can sleep through most minor disturbances.
I do still eat chocolate, but haven't really noticed any effects from that. I will say that Pepsi tastes like cough syrup to me now.
*hugs and sympathy*