Hi. For the past three days, my body has been extremely sore. Especially my right shoulder. Also, I felt as though I had an upper respiratory infection starting. The reason I say this is because I typically get an onset of sinusitis about twice a year, and its like I have the flu when I have one. Well, three days later, with cephalexin therapy, and still showing no signs of improvement. Sinuses aren t bothering me. But, my chest is bothering me quite badly. Almost feels like a raw, irritated feeling, with nausea, no vomiting. And muscle aches. Also, my right shoulder feels as though it wants to pop out of socket. Any thoughts?