How does someone get a diagnosis without understanding what's going on?

I have been on a diagnosis journey for two to three years. My primary symptoms are syncope, joint and muscle pain, and gastrointestinal issues. My pain is debilitating and has been classified as chronic, intractable and widespread. Sometimes my leg pain is so severe that I can't even walk. I have bleeding with bowel movements and excessive sweating. At night, I get extremely hot and tired, and nothing helps. I have a list of other extended symptoms here: https://docs.google.com/document/d/1_A9pycIHkmi4qiCXGsUML5hlyLJ6UjWrC0JHp477NfY/edit?usp=sharing