If it doesn't upset your stomach I recommend taking an aspirin a day (low dose, 1/2 regular dose, either works for me). We all benefit from aspirin each day if it doesn't irritate our digestive system.
As those reading my past posts, I always recommend aspirin to anyone suffering from heart irregularities ... but not if they are already on an anticoagulant.
A long term monitor, say two weeks or longer, should catch the misbehavior for a doctor to study.
Hello...
Since these "flutters" have never been seen while monitoring it can only be speculated that you are probably experiencing a premature beat. Since you have MVP (mitral valve prolapse) it is most likely an ectopic beat originating in the Atria which are called PAC's (premature atrial contractions)
For people who experience infrequent or isolated symptoms, event monitors are the best diagnostic tool to use to determine what is actually going on.