Hi, I'm not sure what the cause is, but I do know that abdominal pain can be felt in areas that do not match up to where your organs are. You can get "referred pain", which is when pain is felt in a different area of the body from the source of the pain. I believe the pain from appendicitis often begins in the centre of the stomach and then later moves to the right side - though only in typical presentations of appendicitis.
What I'm saying is that analysing the location of the pain can be limited in the information it provides as to the cause. Some conditions have typical areas where pain may be felt which doctors can use as a guide when deciding what conditions to test for, but ultimately it's really difficult to tell what you have based on this. We have to go through medical tests unfortunately.
Gastroenterological conditions often cause pain that worsens after eating, or which are only painful after eating. Again, though, this is a characteristic found in so many conditions - and which, at the same time, may not appear in every incidence of any given condition - that it's really hard to begin narrowing it down based on this. Any more specific information that you can give will help your doctors. For example, does the pain worsen after particular foods?
What tests have you had? Your doctor shouldn't really exclude Crohn's on the basis of blood tests alone, so I hope he's continuing his efforts to diagnose you. I've found that when you end up searching online for what could be wrong with you, it's a sign that your doctor isn't doing a good enough job! Reading up on conditions can be informative, but really your doctors should be asking these questions and doing the diagnostic work. You might want to get a second opinion.
