Sometimes you just have to keep at it things, keep waiting, keep appointments, yet it can all become tiresome or exhausting. The point is to rule things out and that sadly just takes time. If things persist, a different doctor or a specialist should be able to track things down. It’s all a cat and mouse game sometimes when the diagnosis is not easily identified. Took one of my friends almost a year before they found what was wrong with them. Just be patient, keep at it, and I’m sure things will eventually get better. Good luck!