I was injected with Botox for migraine on the 18th of December, 2012 and have had flu-like symptoms starting 36 hours after the shots. I get chills and aches around my chest and badly in my hands (I do have arthritis in hands, but not like that.) I have a sort of breathless cough like when you are just getting the flu. As I have had breast cancer in the past year with double mastectomy, chemo and radiation, I am afraid. After cancer, looking over your shoulder is common. I take two Excedrin every four to six hours (Mostly four or five since the symptoms come back fast) and the symptoms actually disappear. And then they are back! How long will this last? I am more than sure it is the Botox because I felt fine up until then. I see other people having the same types of reactions but my doctor thinks I'm nuts. He's a Neurologist.