I appreciate i am very late to this conversation but I just want to drop in that red bull is now a key part of my armoury the moment the dreaded knock kicks in. I will post a detailed synoptic of my experience in coming days but for anyone suffering right now, seriously consider taurine. To me it's a life saver but I do have to say we are all different and some of us have intolerances and other complications so do be conscious of your personal needs. But if you don't have an issue with caffeine and taurine give it a go. Pour on lots of ice and gulp it freezing cold so it hits the back of your throat which is the nearest you can get to your pituitary gland without poking a hole in yourself. The cold soothes the brain and the taurine does some magic and at least dulls the agony. X