I wish for you the best of luck on Tuesday! I hope the test results help the doctors to see how they will best be able to treat your symptoms. It sounds like you are doing everything exactly right so far. You are seeing a doctor, taking the recommended test, etc. I suspect the next step will be treatment.
Depending upon your symptoms, treatment may be as simple as a couple of dietary changes. Although many of us also require medication as well. What symptoms are you experiencing?
What are your symptoms? You are lucky to get a diagnosis cause they usually brush you off as crazy with many unrelatedd symptoms.