Suggest Treatment For Muscle Pain

Hi there! I have had a really bad cold for the past seven days. It s included extreme lethargy, a bad cough that has developed after the first 2 days, stuffy nose, muscle aches and pain in my lower back and my groin muscles that will not go away. Also some ear pressure. General achy feeling, and the usual, hot and sweaty and then cold sweats. No fever, however. I went to my primary and have taken a dosage of Zythromax, which I just finished the third pill yesterday (which made me nauseous andI vomited once). I ve been drinking as many fluids as I can, but haven t really eaten much for a few days (my appetite is feeling like it s coming back today). Any suggestions for the muscle pain, and especially the groin muscle pain? I feel like I ve worked out, but obviously haven t.