I have been having digestive and abdominal problems for two months. Sudden diarherrea, bloating, , no temperature, chills, pain in lower back on the right side, burning in the stomach. Everything I eat, including water, burns as it goes down. Nothing seems to help, not antacids, not eating more, not eating less, not Immodiaum (works for about 3 days and then the diarherra comes back). What is wrong with me? I am 75 years old. I had quad bypass heart surgery 4 years ago.