Did they run the full Celiac Panel bloodwork? If your celiac symptoms are fairly new, damage to your small intestine might not be visible on an endoscopy. That was the case with me 16 years ago, negative bloodwork and endoscopy, but both tests were flawed. I do have celiac. If your tests are inconclusive, you might consider going completely gluten free, keeping a food log to see if your have reactions to gluten-containing or other foods, and what they are. I also have hypothyroidism (27 years), which can result in fatigue if the TSH numbers are larger than 1.5 (which paradoxically larger means smaller with this measure). https://nationalceliac.org/celiac-disease-questions/i-just-had-a-blood-test-and-my-igg-is-6-it-says-weak-positive-what-does-that-mean-to-me/