Oh girl--- sounds like you have every symptom of celiac. Even when everything says it's negative, sometimes the Endoscopy comes back negative too because you may be too young to have all that damage. Most people experience the anxiety, depression, irritability and other mental health stuff before the stomach stuff. The stomach stuff starts, and then it's a good 5 years before people realize "oh, it's something I'm eating".
You know, because your body is telling you, that gluten and you simply cannot mix!
Screw the doctors haha. They cannot do anything for you even if it is positive.
Stay far away from gluten, even shampoos and skin products--- and you will be okay!