I'm allergic to penicillin and cephalosphorons so I have little to choose from when I need an antibiotic. The doxy didn't get rid of my sinus infection and it came back worse so they put me on Levaquin. About an hour or so later my hands start to shake and I feel shaky inside. And my heart starts to pound. If I try to lay down crazy thoughts just go through my head. Luckily I take xanax for anxiety so it helps but is this a common reaction? Should I continue to take it? I've taken 2 out of the 7 doses.