Thanks for your question on Healthcare Magic.
I can understand your concern.
In my opinion, your all symptoms are mostly due to uncontrolled
stress,
anxiety and panic disorder.
But better to rule out heart diseases like
arrhythmia (rhythm disturbances in heart) because heart flutters are common with arrhythmia.
So better to get done ecg, 2d echo and Holter monitoring (24 hours continuous recording of ecg).
If all these are normal then no need to worry for arrhythmia or other heart diseases.
Uncontrolled stress and anxiety are likely in your case.
So better to
consult psychiatrist and get done
counselling sessions. Try to identify stressor in your life and start working on it's solution.
You may need additional anxiolytic drugs too.
Don't worry, you will be alright.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.