Hi. Thanks for your query. Noted the history and understood your concerns. A combination of the rapid hear beats, heartburn, feeling faint and light headedness on eating food along with hot hands and feeling frightened can be due to the following reasons: The commonest being Thyrotoxicosis that is increased function of the thyroid gland. Any cardiac problem. GERD associated with other things as mentioned above. This can be diagnosed by the following: Clinical evaluation and examination by your Doctor. Blood tests of thyroid and other relevant investigations. Upper GI Endoscopy after the clinical evaluation by a Cardiologist, EKG, Echocardiography and other test if normal. All these things will give an appropriate diagnosis and a plan for proper management.