If you have all these visible symptoms and your doctor is refusing to investigate then I think it is really time to get a new doctor. I've changed doctors before because I was being ignored or treated without respect. You need a good partner in your doctor, and it doesn't sound like you have one.
I don't have celiac as I had a normal intestinal biopsy. But I did have a litany of strange and apparently unrelated symptoms before I went off gluten. Gluten intolerance can produce the same problems as celiac, but it takes longer to get that bad, is how it seems to me.
I had pain in most of my joints, muscle weakness such that I couldn't lift a bowl over my head with one arm to put it on the top shelf, nausea, diarrhea, sometimes extremely painful bloating such that I couldn't breathe normally, periodic vomiting, daily headaches too severe to be treated with OTC pain killers, gas and bloating all the time, audible stomach rumblings such that they distracted other people in the same room with me, fatigue, much worsened depression and anxiety symptoms (at first I thought it was a downturn in an existent depression), mental fogginess which is almost gone since going off gluten, greatly worsened acne, extremely oily skin, little blister-like sores in my mouth, dizziness, and I think that about covers it.
The intestinal distress, abdomenal pain and periodic vomiting either cleared up or greatly diminished in the first week of being gluten free. I likely have IBS, though, as I still get some upset, gas, acid reflux and diarrhea. I can live with that, though, the rest was intolerable. The other symptoms cleared up in the following months with some taking a very long time to disappear. I believe my emergent gluten intolerance prolonged my already existing depression for a few years when I could have gotten better. The depressive symptoms lifted slowly, but the joint pain, weakness and heavy fatigue was gone in four to six months.
Going off gluten was life changing for me, but tests would not have found it. I don't have celiac, and so I don't have the antibodies, neither were my intestines showing serious damage. It was a good and lucky guess that came to me after some research, and I am grateful to have found the answer. There is no test for gluten intolerance except to exclude gluten from your diet for a month and see what happens. It's been more than a year that I am gluten free, and I am still seeing more subtle changes as my body returns to health.
Anyway, look into a new doctor. Mine was wonderful and helped me work successfully through the gluten intolerance hypothesis even after the ttg came back negative. You need someone who listens to you, takes you seriously and cares about your health.