Levaquin Asthmatic Bronchitis, Prednosone, Asthma Specialist, Leg Cramps, Calf Muscles

I am a 57 year old male, who is in very good shape and active playing sports. I had a bad cold and had just finished a 3 day "burst" of prednisone per my asthma specialist. I am supposed to keep it on hand and take it if my usual meds and "rescue" inhaler are not working, and I feel that I am going into an infection (asthmatic bronchitis). The steroid treatment did not work, so I saw a doctor who prescribed Levaquin (with a coupon for $15 off) - for 10 days. The pharmacist remarked that they had seen a LOT of these coupons and that the drug reps must be doing their jobs. I read the warnings which noted that "in rare instances, ...". after I got home. Since I was leaving town immediately and did not have time to change meds, I took the Levaquin. I have suffered leg cramps for over three weeks now and don't know when or if they will disappear. The cramps appear in my hamstrings, groin, thighs, and calf muscles. They are debilitating. Sometimes I can barely walk. I am no longer able to play racquetball. I try to stretch out and warm up thoroughly before physical activity, but the cramps still appear in one muscle group or more - then I stop immediately.