it sounds like it only helped the headache so much, because it was caused in the first place by the withdrawal of the caffeine.. so it's not a headache cure, but replacing the drug that was being withdrawn from.
would that not have been caffeine withdrawal though ? If you'continued with the de-caf, those symptoms should've gone in time, like any drug you're gonna notice when you stop taking it.
(peida) Kui Sa tahad kindla mängutasemega vastast, siis võid uue partii loomisel määrata tema BKR vahemiku. Siis teised mängijad ei näe ega saa seda kutset vastu võtta. (Katechka) (näita kõiki vihjeid)