Thanks for your question on Healthcare Magic.
I can understand your concern.
Fluttering sensations, palpitations etc are commonly seen with
arrhythmia (rhythm disturbances in heart).
And if not treated promptly, arrhythmia can be life threatening. So better to first rule out arrhythmia in your case.
So
consult doctor and 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.
Sometimes, overthinking of any thing can also cause similar symptoms.
So don't think too much, relax and be calm.
It's good that you cut down caffeine intake.
Don't worry, you will be alright,but first rule out arrhythmia.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.