I'm a 'full fat' coke addict though pepsi is fine as well, I did do ok with supermarket own brand for a bit but my brain soon realised its fake lol and started to taste funny. I do like coffee as well. I do have CFS and I have tried everything, and caffeinated drinks are the only things that truly cut it for me. In my teens when it was at its worst and I missed a lot of school because of it; I stopped drinking pepsi for three days (I preferred pepsi then for some reason and it was on offer a lot more so made my dad happy) and I was literally only awake for two hours on each of those days xx