Muscle fatique symptoms and conditions

I am a 42 year old healthy male who works out and, therefore, I know what muscle fatigue and common muscle cramps feel like. However, today was my 10th dose of a 14 day supply of Levaquin 500 mg for a chronic cough and possible sinus infection. Suddenly this morning, after walking down 1 1/2 flights of stairs at our church, both of my calves simultaneously cramped so severely, I lost feeling in both of my feet. I had to grab the handle bars to keep from falling. Once we got home, I wrapped my calves in a heating pad for an hour which did little to relieve the pain and cramping. My calves are now noticeably swollen with continued cramping. I can barely walk. Suspicious of the Levaquin, my wife googled the drug and found this website. Thank God! Now all we can do is pray that the suggestions for self-help posted on Oct. 27th will work and that I do not develop any further side affects as others have posted. I will also alert my GP on Monday of this website as well as everyone we know.

I have been on lipitor about 4 yrs. I am a runner and keep tract of my times. I have been losing about 4% of my speed each year and have recently had a large amount of muscle fatigue. Today a ran a 940 pace and thought I was not going to make it home. Three years ago my average pace was 805. Could the 20mg dosage be causing this problem?