Hello, nice to meet you. I have multiple sclerosis and it took YEARS to get a diagnosis. till then I was treated as if I was whining and simply looking for a way to get out of work. I was dismissed, treated rudely, and told I needed "more busy work" to keep my mind from thinking up new symptoms. Turns out a few years later the lesions started appearing on my MRI and the big boy hospital said "you have MS!, you are not faking this." What a huge relief!
Best advice is to keep seeking a doctor till you find one that listens to you. To be labeled as Munchhausen without a proper work up, or a proper way to be followed was just cruel! Even if you have this disease, you would need sympathy, empathy, treatment and the respect and caring of the medical field. not to be treated as if you were just looking to pull one over on everyone.
Hang in there.