I feel a fluttering in my chest, left side, right below the rib cage.  It is intermittent, faster than my heart beat, and lasts from 5 minutes to a half hour.  No pain at all.  I can look down below my bottom left rib and actually see the chest area of the flutter move up and down  with each random thump.  My wife checks my heart beat over my heart and the beat is steady.  The flutter(thump) and my heartbeat are not at all synchronized.
Let me explain ...you have fluttering on left side chest AMD you have seen it ...when your wife checked pulse was alright ...now one thing is clear that you are having arrhythmia of heart ...you have to go to your doctor .he will check your blood pressure and ECG ...if both are ok then you should be put on holder monitoring in this a monitor is put and 24 hrs ECG is recorded and analyzed to see any random problem ...in meanwhile avoid tea coffee alcohol