Hi Shebutz,
I'm sorry you are going through this. Your GP can do a celiac panel. It is just a blood test. However, you do need to be eating gluten (wheat, rye, barley) for it to be accurate. What is often recommended is the equivalent at least two pieces of bread daily for I think six weeks before the test. The problem with the tests for celiac is that they do have a significant false negative rate, so if you are not eating gluten the false negative rate will be even higher. The same with the endoscapy. Depending on how damaged the villi are, if they have started to heal the doctor might not find damage. I hope what you have is not celiac 'cus it really sucks. But if you find out it is, feel free to ask me any questions you have.