Could I have a stomach ulcer?

I'm really freakin out. I have this annoying, gnawing discomfort / somewhat of a pain in my left abs. It was there, and then went away for awhile (maybe a few weeks or a month or more) and is back again. I heard ulcers can have fluctuation periods between pain and no pain. I don't have any other symptoms I don think... I am hungry alot... I fill up pretty fast after eating a bit. I lost a couple pounds but it may be because hi just had my wisdom teeth pulled and i have been eating lighter. I have an appointment with my doctor next Thursday but is prolonging this going to make it worse if it IS an ulcer? What else could it be? Suggestions?