Talk to Gastroenterologist on Stomach Burn

40 day's ago i was diagnosed with stomach burn/acidity in stomach, which caused heat in the whole body. And a fast heartbeat aswell. Went to doctor's and they suggested a medicine and asked me to drink cold fluids and juices. I recovered after 5 day's but now again after 40 day's i am feeling same condition. Heatness in lower heart area (ie maida), I've started taking Sandal Juice and Tukham balanga to keep stomach cold. What is the proper solution for this issue? If any medicine suggested that will also have affect on stomach which is not in proper order. Note that, the stool is also unsual and frequent ie twice a day. Same as before 40 days.