Chocolate and afib

Its May 2013.  My afib had been under good control with only one or two minor episodes per week over the kast six months.  Episodes wee reduced by drink tonic water (quinine) every day.  In the last two week my epsidoes have increased and gone more severe.  I think becuase I've started eating chocolate and hot chocolate daily.  I have to cut that out to see if there is a reduction.