question: i had the flu/fever for 4 days, got better, then developed a sinus infection 2 days later. I went to my doctor and she prescribed me the 10 day antibiotic amoxicillin for my sinus infection. I have been taking it for 3 days now but the first day I was on it I got that wispy feeling in my throat that you get just before you get a cough. The next day I started lightly coughing. The next day I started a deeper cough and I could feel it may have traveled to my lungs. Today is slightly better but I still have congestion and a cough. Also throughout my entire 2 weeks so far of being sick, there has been a sore-like pain throughout my left arm, particularily my triceps brachi long head, flexor carpi ulnaris, and also the top of my rectus abdominis right under my diaphragm. What is wrong with me?