Stomach pain and getting worse. Help please!

[Coastpaige]

I have stomach problems for 9 years now. I am 16. I have been to numerous doctors and they have no idea what is going on or they say in faking. I am currently going to a new doctor but he doesn't know where to start bc every time I go back I have a symptom. My symptom currently are: Blood in still Hurts-around belly button but the whole stomach area hurts- My hair falls out alot(not sure if it's a symptom) - I stay with headaches - I am always sick- I always have ulcers in my mouth. I have been diagnose with h-Plyori but they don't think it's that bothering me now. It is getting worse. It wakes me up every night. I can just be sitting down and it will hurt for no reason. I have been tested for like chrons and all that. So I am thinking that I may have something rare bc they never thought of that. Can somebody  list some rare or even some common diseases that I may have can be useful for my next doctor appointment. Thanks

[anders_m]

Could be functional abdominal pain. Abdominal pain that appears with no reason and has no cause. I dont recommend bringing up diseases you have researched on your own with extensive knowledge because it can sometimes lead to doctors believing it is just selective suggestion. You need more test run before a diagnosis is done.

[cnoevl21]

Go to an allergy specialist and have them check you for every food allergy in the book.
What tests have they done? Endoscopy? Colonoscopy? Ultrasound? CT scan?
Have you been tested for all the STDs (if you are sexually active)?