Yes we can drive ourselves crazy with all the info the net provides. I have been there so many times and I also have anxiety disorder so it doesn't make things any better. I know its hard but try to relax. You are very young and although its not unheard of for your age to have major problems, the probability is very low.
If it is a stomach ulcer, the fix on that is pretty easy. If its caused by H-Pylori bacteria, they will prescribe you antibiotics and put you on a PPI (Nexium, Prevacid, etc) for a week or two. Stress doesn't cause ulcers studies have shown as it was believed to be the cause in the past. The cause of stomach ulcers are from H-Pylori bacteria or overuse of NSAIDs (Ibuprofen, Aleve, etc.)
Anxiety can cause a lot of stomach upset so if you tend to be a worrier, your symptoms are probably just magnified (like I said, I am the same way).
I hope you get some answers soon. Appointments for specialists always are very difficult to get soon. Sometimes I can't get in to see my GI for a month or so.
Good Luck and post how your appointment goes :)
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