After approximately 30 minutes to an hour after eating a large salad, I am wrought with horrible stomach pain, lower back pain, bloating, and fullness that can sometimes lead to reflux and heartburn type symptoms. It literally feels like someone has reached into my body and is squeezing my stomach. These symptoms can last for up to three consecutive days. I have no diarrhea or constipation issues and the stomach pain is not relieved after bowel movements. I am a 38 yr old female and have no known food, gluten, or lactose allergies. This just came on within the last year.