I Am Experiencing Indigestion For 6 Mos- 9 Mos Without

I am experiencing indigestion for 6 mos- 9 mos without significant change in diet. with bloating, burping, burning in the chest and throat (no vomiting, but close) mostly after meals, even with unspicey, low fat food. I've been cutting back the portions. Love vegetables, minimal meat. Coffee and tea 4 x/day. 16-32 oz water daily. No history of digestive problems. No history of food sensitivity. I could basically eat anything, in any volume until now. I should add, gained 30-40 lbs in the last 2 yrs. Stable now and working my way down.