Origin of the idiom you have a splitting headache?

What would can cause lightheaded and dizzy and my lips and tongue sometimes tingle? How can darkness make your eyes bleed? What is the meaning of having a cold tingling sensation on the right side of the neck? Is neuroforamen in the back or neck? What wave must occur before the ventricles can contract? What is the use of uterine sound? Who wrote prevention is better than cure? A deficiency in which nutritional substances obtained from the diet can cause an anemia? What disease do you have if you spit blood? Is Enlarged Prostate cancerous? What are the similarities and differences between Down syndrome and Turner syndrome? Can you forgive someone if they hurt you emotionally? Are handicap stickers available before knee replacement surgery? What causes bureaucratic paralysis? What phobia is the fear of soda? What are the differences between antigens and vaccine? What is the major difference between results section and the discusion section of a scientific paper? How do you prevent gerd? What are some of the symptoms of catatonic schizophrenia? What is the URL about what makes you hiccup?