I also had extreme heart palpitations on Levaquin, as well as aching in my muscles and nerves throughout my entire body. I finally put the feelings together with the drug after I kept feeling that way several times. I finally realized I was on these antibiotics each time. I hurt so bad one night, I felt as if my own body was crushing itself, and l laid awake for hours afraid to go to sleep that my heart might stop. I got online a found a site about the adverse reactions and realized what was happening. I quit taking Levaquin the next day. Each day I felt better, but it took a few months before the feeling deep in my nerves and muscles finally went away. I hope you feel better soon too.