Medical workers of Reddit, what is the rarest disease you have seen a patient correctly self-diagnose?

50-ish year old female presenting with left foot pain and weakness. During the evaluation something seemed off. I asked her questions about her balance, her stamina, and her strength before starting my screen. She had a long history of anxiety/depression and told multiple practitioners she felt weaker and more fatigued over the past few months. They shrugged it off as depression/deconditioning, and told her to walk more. She wondered if she had the beginning stages of Parkinson's.

I start my physical evaluation and, yep, her muscles aren't behaving normally. She has cogwheel rigidity in several muscles, and increased tone in others. No one else had done these tests on her, she has no neurological diagnosis, and I'm secretly sweating bullets as I try to strike the conversational tone of "don't freak out, but this is a problem". I tell her these are abnormal findings, and as a PT I can't diagnose her, but she needs to make an appointment with a neurologist soon. Yep, it's Parkinson's.

/r/AskReddit Thread