Who is a friend 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!