Thanks for your question on Health Care Magic.
I can understand your concern.
Possibility of stress related palpitations and muscular cramps is more in your case but better to first rule out heart diseases like arrhythmia.
Arrhythmia (rhythm disturbances in heart) like atrial
fibrillation (AF),
atrial flutter, supra
ventricular tachycardia (SVT) can cause fluttering feeling in heart. You are also having positive family history of heart diseases.
So better to get done ecg, 2d echo and Holter monitoring (24 hour continuous monitoring of ecg).
If all these are normal then no need to worry for arrhythmia or other heart diseases.
Stress can cause similar symptoms.
So avoid stress and tension, be relax and calm.
Consult psychiatrist and get done
counselling sessions. Try to identify stressor in your life and start working on its solution. You may need anxiolytic drugs too. Don't worry, you will be alright. First rule out heart diseases.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.