Hello Caroline, welcome to HCM.
I understand its a very complicated situation. When eating 3 times a day is our regular pattern, any problems with that can be really frustrating. Since you have been suspecting peptic ulcer
i am sure you might have tried modification of your diet. With regards to diet, avoid any spicy/fatty/heavy foods. There should not be any strain on the digestive system. Consume steamed/boiled foods. Also do not consume too fibrous foods as they might irritate the bowel system. Drink a lot of water throughout the day. Do not give too much gap between meals. Try to have something every 3 hours. Also, consult a doc for the body pains.