I have been feeling nauseous the last week or so and I have been having pains in my abdomen. I have had loss of appetite, I still feel hungry around the time when i'm supposed to eat. Force myself to eat (not my normal amount) and then shortly after I get abdominal pain. I get abdominal pain especially in the morning when I wake up (and like I said before, after I eat). I've also been very thirsty and have had slight constipation. Could I have an ulcer? If so, is there a way to treat it?