I keep feeling fluttering in my chest. i have had an ekg done at the doctors and it shows normal. it feels like my heart is having trouble beating.

May be normal.: If you had a normal ekg while the symptoms were occurring then this is nothing to worry about. If there is just a single flutter or sensation of a single extra beat and you have no trouble with exercise then it is very likely benign, but if the sensation lasts longer it might be worthwhile to have a holter or event monitor placed.

Symptom rhythm : The key question is whether the ECG was done when you were having your symptoms. If not you should get a longer term monitor like a 24 hour holter monitor or a 30 day event monitor. This will allow the cause of palpitations to be determined and a treatment recommended.