After reading some of the other postings, I consider myself lucky so far! I took my first dose of Levaquin 500mg yesterday evening. Last night I went to bed and after about 1/2 hour of sleep, I woke up and shot out of bed. I just wasn't feeling right...kind of anxious, couldn't focus, stomach cramps and nausea, had chills and a bad cough, and some chest discomfort. Later, I started developing a headache. Today, I still don't feel right at all and have put a call in to my doctor, but honestly, I don't want to put any more medication into my body! I will not be taking this medication again.