First diagnosed with restless legs, and then multiple myeloma?

Hello, I’m really desperate suffering with chronic pain, autoimmune disease, diseases, fibromyalgia, chronic fatigue, and 25 other medical conditions, but the restless legs is just killing me and no medications have worked at all. I researched because it feels like it hurts to the bone and it came up that RLS Sometimes misdiagnosed and it’s actually multiple myeloma. Does anyone have an experience with us?