CIDP and Rheumatoid Arthritis?

I was diagnosed with CIDP in April. Before and since my diagnosis I developed small, hard lumps on the knuckles of my left ring finger and right thumb, about the size of a pea. At first they hurt, but now they don’t. I have also been struggling with a very painful neck and headaches for the past year and a half. I read that RA often attacks the neck. I wonder if it is possible to have CIDP and RA?