Hello Sameer and welcome
Thanks for the detailed history. Your heart is absolutely normal and nothing to worry about it. These all chest pain
palpitations look like due to stress or anxiety
. Do regular exercise that will give strength to your heart muscle and also help in reducing your stress. Yoga and medication also helps a lot. Keep your mind relax as you are a health person. Can take tranquilizer as prescribed by your doctor to get sleep at night.
On thing you have to rule out for neck and arm pain
is Cervical Spondylosis
. Get your X-ray done and according treatment can be planned. Take all the precaution for GERD as it may cause chest discomfort
. Do not lie down after meals, take a walk for about 30 minutes. Avoid over eating and spicy and junk food.
Hope this will help you.