Sorry, posting here for traffic as I never seem to get a response in any other topics. Please can anyone advise on how bad the side effects are from the adult flu jab? I have never had one before and am booked in tomorrow but I have a really busy week and I'm worried it will put me out of action for a couple of days. How Ill have you been post jab? Is it just feeling a bit shit but able to crack on, or worse?