Apple Cider Vinegar Remedy for Headaches

I originally bought organic Apple Cider Vinegar for my skin because I keep getting cystic acne and there is literally nothing I can do externally to help because they never come to a head (gross I know) so, after using it everyday morning and night, it hasn't helped with anything! And my skin is now very dry and smells like vinegar... Which frankly is disgusting in my opinion. Now, I'm having a terrible headache and looked to earth clinic to find a solution and drank 1/4 cup of Apple Cider Vinegar straight, which is also pretty disgusting... And nothing. I don't understand why I don't see any results from this????