Erratic heart beat symptoms and conditions

I started taking Levaquin 500mg on Jan. 28,2009 after having it prescribed fby my cardiologist for a lung infection, after he conducted blood, urine and heart ecosonogram tests over the three previous days. I had an infection, everything else was fine. I am 55 and have mitral valve prolapse and have been treated 20 years ago for atrial fibrillation, hence my primary care doctor is a cardiologist. Willingly starting the treatment of one tablet a day, I noticed insomnia the first and subsequent nights, tiredness and probably depression as my friend and wife said I was acting a bit "needy" and anxiety. My family commented on my anxiety as did my friend who I only email and phone. My infection noticeably improved so I was feeling better and marked it up to having been sick, until the 4th day when I starting having shortness of breath and I noticed a feeling I knew well but had not experienced in 20 years, my heart area hurt in a mild way and I felt flutters, just enough that I pulled the medical paper for the Levaquin and read the side effects bar. Low and behold all my side effects were listed. "Rare but could happen in patients predisposed to heart problems" On Monday Feb 2nd I called the doctor with my concerns but he assured me that is was not the Levaquin but he made me an appointment to check things out. So one week into the 10 day course of treatment I had another checkup only to find an erratic heart beat but on the slow side not the pounding which is normally associated with this problem. So now my doctor "who is a friend" so I am not a number, wants me to start on an anticoagulant"Coumadin" to ease the pumping in my heart and then further exams and medication for "life" for my fibrillation! Problem now is I have one more pill of the Levaquin of the 10 pill series which I "should take in 10 minutes ( I just found this site)! I have decided not to take any more test or medication of any kind until I feel this Levaquin is completely out of my body. Does anyone have any ideas how long that could be? P.S. My heart still feels like it did earlier in the week!

THIS DRUG IS HORRIBLE adn should be taken off the market...im a 21 year old male in decent physical shape...i was taken to the ER for dehydration from what i thought was a virus...the ER doctor couldn't tell if it was a virus or a bacterial infection so he automatically prescribed me Levaquin just in case it was a bacterial infection...Now it really makes me mad that he wasn't sure what it was and he prescribed this poision to me....but anyways he gave me one pill at the hospital 500 mg and prescribed 8 more doses to be taken home...that night i felt HORRIBLE! my heart had this erratic heart beat...my breathing was irregular...i just thought i was over reacting....that night i couldn't get to sleep i was tossing and turning...the next day i felt like my love handles were SWOLLEN and it was a very uncomfortable feeling also i had a painful jabbing/burning feeling in my lower back it was horrible...i just thought it was part of the virus...as the week went on things got worse i started developing anxiety...and i felt depressed...i actually told my mom i felt like i was dying...it was a miserable experience...my mom then insisted it maybe a side effect of the levaquin so we called the doctor and of course he said "Hes never heard of anything like that" he also told me i should stay on it b/c if i stop the antibiotic won't work or w/e and ill get sick again so i stupidly listened to him and things got worse...the last couple days my eyes felt really weird they were very dry and irritating and when i woke up in the morning or went from very dark to a very light environment everything was so bright it hurt to look at the light...ive been off levaquin for a week now and i feel a lot better but still have problems with my eyes...they are still irritating me and are very dry and now my legs feel weak and sore...i never thought an antibiotic could be this potent...thankfully my anxiety and depression have subsided a little bit...IM NEVER TAKING THAT DEMON SEED AGAIN!!!!!