Daily heartburn

Since I was about 17 (I am now 27) I have had stomach problems. Mostly heartburn and a very bad pain. After FINALLY going to a doctor about 5 years ago I was diagnosed with an ulcer. I was given a medication called nexium and another pill. In all I was taking approx 3 pills for a month. Well the Ulcer healed fine and dandy. But what hasnt went away is the heartburn EVERYDAY. I take zantac 150 bu that doesnt do it. I have to one 150 plus a half a one. Therefore taking approx 250 mg of zantax.

This may be a bit strange but in the past 5 years..if I eat too much food and I feel full..I put pressure on my stomach...not with my hands but you know when you have to burp? Well I put pressure on it by holding my breath and pushinga little. I can bring the food up very easily and discard it. Gross I know but its quite easy. I dont make myself sick..I dont do anything but simply that. I go to the toilet and simply bend over and push the food back out like a water fountain.

Why does my body do this and is it serious?