I was giving Levaquin for a sinus infection for 5 days at 500mlg. I finished the last dose two days ago and can now barely walk. To get up from a sitting position feels like my knees are going to break. I thought it was the medication because I read that there could be tendon problems on the insert. But I didn't see anything about joint problems and my elbow is hurting too. I hope this doesn't last long.