I have CIDP. It was not diagnosed correctly for 2 years after symptoms started, tingling and numbness in lower extremities. I was on IvIg twice and prednisone once. Neither helped. I was then given VyGart-Hytrulo - no improvement after 14 weeks so it was discontinued. My condition has gotten worse over time, mainly fatigue, loss of strength and balance issues. I am being treated at the University of Pennsylvania, one of the GBS/CIDP Foundation International Centers of Excellence. I am now in a drug trial for Riliprubart.
https://www.sanofi.com/en/media-room/press-releases/2024/2024-06-25-20-30-00-2904145
My CIDP is idiopathic - no known cause
There is a newer trial for a drug called Captivate
Good luck finding the help you need.