Kimberly
I am not a medical doctor, but I had an ulcer 20 years ago and it perforated sending me to the hospital and immediate emergency surgery to repair the hole in my stomach. I was in the midst of testing to find out what was causing my weight loss and pain when this happened so it had not been diagnosed as yet. So the answer to your question, is yes, an ulcer can be serious. If medication and diet are not helping, I would suggest you get a second opinion to help ease your mind.