Time to give up coffee. I've been using caffeine as a crutch for way too long. Cold turkey day. I've done it before for several years, and it's time to do it again. Time to stock up on the nurofen for the next two weeks - they are probably not going to be pretty. Though the exercise will hopefully minimise the headaches I know will come. Natural endorphins are brilliant for this, so maybe I'll stick to one pack of nurofen & see how it goes.