I think I found the cause!

Hi, so I was convinced I had leaky gut syndrome for the past month or so, probably due to celiac disease. It doesn't look like I have celiac, so I thought next that this has to be leaky gut. Now I got a book from the library about fibromyalgia, and I am watching a YouTube video on it and OMG!!! I'm pretty convinced I have found a cause. The last doctor I saw thought it could be dysautonomia, which would explain a lot, as well. It seems like everything goes hand in hand (neuropathy, vitamin deficiencies, stress triggers, fibromyalgia, food intolerances, etc. etc.). However, my thyroid levels were on the hyperthyroid side. And I have trouble gaining weight, not losing it. I am also only 21, but considering my life, I am not surprised I'm going through all of this. It's the brain fog that is the worst.... I am graduating from college in two months and took this week off and got a doctor's note. I am taking Adderall, but it's not working anymore since my symptoms got worse. What's with doctors and NPs calling this anxiety, PTSD, or psychosomatic and sending me on my way? What's so bad about giving a diagnosis? Do they honestly think I'm making up this pain? I'm 21! I feel like I'm 100. But it seems like this condition can be easily managed, which is good.