Hello,
Warm sensations or burning sensation in the chest is commonly due to 
acid reflux, 
dehydration, stress, anxiety or 
tachycardia. You had EKG done and it showed normal reports. However, you are suggested to do stress tests and blood tests for 
lipid profile, Urinalysis & blood glucose to rule out any developing coronary artery disease as you have symptoms of palpitations.
If obese, control your weight & cut on refined flour, red meat, trans fat, salty food, carbs. Take whole cereals, fruits, veggies & lean protein. You can take antacids and PPI's for relieve. Avoid sedentary life and do regular walking. Avoid 
constipation. Stay well hydrated. Avoid stress and anxiety. You may need anxiolytic's. If hypertensive, control your blood pressure at all cost.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Nupur K., General & Family Physician