Hello,
This feling of your heart flipping over can be from an irregular heart beat / a skipped beat.
This can also be from a Hiatal Hernia or Acid Reflux.
I would advise you to see a doctor to have an EKG and rule out a heart cause like an Arrythmia that could have been brought on by stress.
Having a Chest X ray would also help in looking ofr a possible hiatal hernia / any othre chest cause.
Kind Regards, Dr.Joshi
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Doctor
Medical Diagnostics : X ray, CT Scan, MRI, Ultrasound, Angio. Caring Doctor. Your Health, First !