Hi! One of the symptoms of fibromyalgia is Raynaud's-type symptoms. With Raynaud's Disease, the extremities will get cold and the fingers will turn white so part of what you described seems to fit. I'm not saying you have Raynaud's but you are possibly having symptoms like that but being caused by fibro. You should talk to your doctor about that.
I have had tingling and numbness, occasionally, and that is caused by nerves. But, it's not nerve "damage" because it has gone away. When you have nerve damage and it doesn't go away it's called neuropathy. Diabetics can suffer from this.
I would suggest you talk to your doctor about it, maybe ask to have your thyroid checked. Many with fibro to have hypothyroidism.
I'm sorry you are going through this right now. Hopefully this will go away. That's what I always think when something new pops up. I expect it to go away and then I focus on other things. I do not dwell on the problem and start worrying about it. That usually makes things worse. If something really concerns me, I see my doctor. I hope this helps and please let us know what you find out.
Sherrine