Any speech problems? Blurring vision? Trouble swallowing? Drooping eyelid? Weakness in arms, legs? Difficulty breathing?
If any of the above, check for myasthenia gravis.
Frequently mis-diagnosed. It’s treatable but by the time doctors figure it out, the patient has usually gone through hell. My mother nearly died from it. The ER doc told me she was “getting old”. Once she got treatment, she’s pretty much back to her old self... we can hardly keep up with her.
Good luck... don’t give up. Doctors know a lot, but not everything.
Speech problems, yes. Weakness in arms and legs, yes. She hasn’t mentioned blurred vision, trouble swallowing, and her eyelids look normal. Thanks.