I have IBS and diverticulosis. My IBS has improved to going to the bathroom only once or twice since a suggestion from my gastroenterologist to eat a probiotic yogurt every day. However, after a bowel movement, I get a stomach ache ( not nausea), sometimes heartburn, muscle aches, fatigue, and just feeling so ill. Today I had to lay down for over an hour, and I thought it was the end of me. ( I am 75). My doctor just says to take an antacid. Is this part of IBS or something else? It is not as bad every day, but today I was crying.