I finished a course of Amoxicillin for a Sinus infection about 2 wks. ago. I felt better. Then, a few days after, I started to feel cold-like symptoms again, this time with a loose cough. I began taking Mucinex-D immediately, and I have coughed up yellow mucus. I feel ok...I m just conjested and after I wake up I have a sinus head ache. Should I go back to the doctor to get another antibiotic, or should I just continue the mucinex, fluids and rest and wait it out for a few mor days? Also...I realize that i forgot to change my toothbrush after i was sick the first time...could I have reinfected myself?