I'm taking levofloxacin and I'm having the worst body pains. My legs are swollen and bruised, is there anything I can do to stop the pain?

See your doc! It sounds like you could be having a bad reaction to the levofloxacin. You should go back to your doc to have this evaluated and, if necessary, be given a different antibiotic. If it is a reaction, it should slow down and stop once you switch meds.
Stop antibiotic. This is suspicious for reqction to antibiotic which is causing toxic reaction . Stop the drug and see your doctor for blood tests immediately to determine if tree any blood changes on comprehensive panel in liver, kidney, or muscles enzymes.