I have been having flu-like symptoms for at least a month or more. Some days I feel alright and others I wake with a head ache and achy all over and pain in the back of my neck and shoulders. Sometimes dull and sometimes sharp. Also pain in right elbow and right knee once in a while. Severe fatigue, dizziness, and recent weight gain. Other flu symptoms include chills and some nausea. About a week ago or more I was sure I was getting a cold, but never had any stuffiness or congestion.