Are you in need of the ultimate hangover cure? Headache, nausea, aches and fatigue? If you've been over indulging, your hangover isn't the leftover alcohol in your body, it's the aftermath of how your body processes it. As your body breaks down alcohol, the toxic by-products affect blood flow to the brain and impair its function. In fact, studies have shown that hangovers can adversely affect a driver's performance to the same extent as alcohol. Here's the BBC's Ruth Alexander with what to do -