I have 2 autoimmune conditions. I can only speak from experience. My doctors are engaged and they care, but there just isn’t anything they can do. Whenever they look, they find something. It’s to the point where I just don’t want them to look anymore 😂 If it is autoimmune, and not inflammation caused by an infection or cancer, there’s no cure and you won’t get better. If it’s an infection you’ll have a fever, a pustule, open sores or something like that. If it’s cancer your white blood cell count will be elevated. Mine always is. The symptoms you describe sound like you should try taking dietary measures first. Increase your b vitamins to help with hair growth (eat more fish). Spend more time outside in the sun, since sitting in the dark increases fatigue and decreases d vitamins. Joint pain can be caused by lack of exercise, because your body needs to move. I try to do some kind of workout or yoga daily. Sometimes -even for me- the simple solutions are the best ones. My husband had all of your described symptoms when I met him. He was extremely pale, played a lot of video games, had a lot of bread in his diet and not much else, only ate once a day, and didn’t spend much time outside. Acting sick can make you sick. I had to drag him out in the sun. Doctors can’t really know your lifestyle unfortunately in the like, 10 seconds they give you to explain the problem. You are your own best physician in that way.