Guys and gals make sure that you listen to your bodies. Here is a picture of my husband's ulcers as you can see he had more than one. His hgb is 8.5 today. I don't know if they are going to give him another transfusion or just make him stay another day to see if it drops any lower.
Click on the picture to enlarge it. He has a scar from a previous ulcer, gastritis (circled), a really bloody ulcer, and another ulcer. These are all in his stomach.
http://www.webmd.com/content/article/90/100627.htm (This page talks about signs and symptoms of ulcers.)