I've woken up this morning and I feel terrible! Like I've got the biggest hangover in the world - which is impossibly as I haven't drunk! Heads pounding, stomached churning but I ache all over like I've got flu normally when I get ill, it starts showing about 4-5 days before I feel this bad, but I was fine yesterday! is it normal to go from fine to feeling like I have full on flu over night?! x