hi im 30 yrs old and ive gone to the doctor because ive been experiencing chest flutters and thumps, while at the exact time of these flutters and thumps i experience light headedness or dizzyness and then as soon as the flutter or thump ends which is only a second or two the dizzyness or lightheadedness goes away and i only have these maybe once a month mostly, but sometimes ive had them 3 or 4 times a week or 3 or 4 times for one day in a month,then i wont have anything for months, only once did it happen for 3 days in a row several times a day, the holter monitor results said that i have a very,very,mild sinus tachycardia, but isnt sinus tachycardia a constant elevated heart rate, i never feel my heart racing, i only feel these flutters and thumps and the dizzyness or lightheadedness,no fast heartbeat or anything, another thing im confused about is when i have these flutters and thumps the dizzyness or lightheadedness is simultaneos with the flutters and thumps not before or after they happen,actually i really dont know if its lightheadedness or dizzyness im feeling its kind of hard to explain its almost like an out of it fainting type feeling, if anyone can help me i would very much appreciate it, thanx