Keep suffering symptoms and conditions

In July of 2005, I was prescribed 14 doses of Levaquin 750 mg for a bad case of viral pneumonia and mononucleosis. After two days of insomnia, I developed extremely painful feet, especially the bottoms of my feet. Last month (Aug 2007) I was diagnosed with Avascular Necrosis of the Hip, and just had my right hip replaced (total). At age 45, I am fairly young to have developed such an ailment and other than July of 2005, have been healthy and active my entire life. In retrospect, I am beginning to wonder if Levaquin caused my avascular necrosis, as the doctors are at a loss.