I am taking a new drug called Moxifloxacin. This is my third day. Last night my heart was beating real fast. It lasted about 3 minutes, then stopped. When I took the drug the first day it did not bother me. Yesterday I had an upset after taking it. Today it made me very nauseated about a half hour after taking it. but it seems to be better now except for the belching and that has now almost stopped, too. I take Citalopram, Atorvastatin, Atenolol, and Lansoprazole, plus some natural herbs and vitamins. Is it ok to keep taking this medication?