I have been taking Levaquin for 6 days. The doctor prescribed it ...

I have been taking Levaquin for 6 days. The doctor prescribed it for a sinus infection for 21 days. Day 1, I could hardly get out of bed, all I wanted to do was sleep. I am still very tired and my muscles are weak not sore. The other thing is my infection is not gone if anything (sorry about this) the mucus has become an even darker yellow - I would call it gold. How long does it take for this stuff to knock out an infection? I haven't experienced any other side effects (yet). I just want it to knock out the infection so I'm not on different antibiotics in 15 days.