I'm on remicade just did my third treatment one week ago. The last three days I've been feeling like I'm getting sick. Body ach sore throat. Did not think much about it until tonight. I've had fever on and off I'm coughing up yellow/blood color mucos. My head hurts my body aches and I can't sleep. My chest feels so tight and deep breaths hurt. Should I be concerned? I'm trying to see if I should go in to the ER or just call my doctor? I never thought that it could just be the remicade.