Hi, I have this same numbness and I also have a vibrating buzzing feeling that goes all the way down my body. Doctor keeps saying this "can" happen with Fibro, but I'm not convinced there's not something else going one. MRI and other neuro tests are all normal.
Question: Does your numbness restrict your movement? I have problems walking and using my hands at times - doctor doesn't seemed concerned and thinks it's caused by the fibromyalgia. I haven't heard of this with fibro.
Hope you're doing ok. Good Luck.