You usually get a burning, gnawing feeling just after eating as if you are still hungry. It may also wake you up at night. There are two types of ulcers, Peptic is a small hole in the gastro tract and Duodenal occurs in the small intestine. I had an infection called Helicobacter Pylori which is the major cause of ulcers .Perhaps you should pop along to you GP for a chat and ask for a test.