While eating food i am feeling heaviness in upper abdomen as i continue to eat, after sometime it is fine.

GERD: You may be describing gastroesophageal reflux aka GERD aka acid reflux. See if calcium supplements like Tums (calcium carbonate) & Rolaids are enough to control acid. Failing that, ask your pharmacist for over-the-counter H2 blockers, then proton pump inhibitors. If your heaviness is only after you eat fatty foods, you may have gallbladder stones. Abdominal ultrasound can check for stones & other conditions.