Did anything ever make you doubt your diagnosis?

I’m diagnosed with FND, due to a lack of any abnormal tests, however I have no positive symptoms of FND. This makes it very difficult to accept the diagnosis. Does anyone experience something similar? I’m constantly worrying that it’s something else. Standard therapies also haven’t worked for me and it’s been a year of constant decline. If you were ever in such a position, what did you do? Did you continue to seek alternative diagnoses? Did you find an alternative therapy that worked for you? Did something ever completely discredit your diagnosis? Thanks!