I took one (prescribed) vicodin following dental surgery last weekend and got very nauseus. I eventually threw up. It is 4 days later now, and I'm still barely able to function due to a severe headache. What is going on? I've taken vicodin when prescribed numerous times before and no such reaction. How long will this last? Is there anything I can do or take to help the headache? This set back has cost me a week's work and a major business opportunity. I'm a startup founder and when I can't work, I am that further away from having any income. Thoughts? Experience? Advice?