My Aunt, who is 89 yrs old had a tetanus shot one week ago. Apparently, she has had swelling in her left arm and a knot where the shot was given sub Q. It is too late to call the doctor, and I am worried if this will get worse though the night. I am in North Carolina, and she lives in Vero Beach, Florida. Can this wait until tomorrow morning??? She did not get a reaction until today at about 5 pm.