I can understand your concern. It is frightening to have pain, not be able to eat well and then have doctors not find the reason. As others have said, I would encourage you to see a gastroenterologist ("GI doctor"), this type of doctor specializes in stomach problems.
Here are some questions for you to think about as you consider thinking about this problem. Please share as If you are comfortable doing so. Could you share where you have this "stomach pain"? Is it the upper or lower part of your stomach? Near the ribs? Do you have it all the time or are there some days when you are free from pain? Have you had any accidents recently such as a slip and fall or an injury playing sports or perhaps been in a car accident?
I look forward to hearing from you. Will you post again and let me know how you are doing?