Hi, I can see that there are people that are having unwanted side effects. It has to be very scary seeing that right before you are scheduled to start. So, I thought that I would let you know that I just had my 4th dose. I am one of those people that has a *horribly* sore arm for a couple days from a simple flu shot. I felt like I had the flu after the shingles vaccine. I even have a noticable scar from a childhood vaccine. I haven't had any adverse reaction to this at all. Nothing! So, try not to pre-worry. I really hope this helps. For reference, mine have been in upper arms.