I noticed on my fingernails they have turned a blue and purle colour this caught the attention of my neurologist? nerve damage?

See below: You may have condition called raynaud's. If it is bothersome, you may want to see a rheumatologist for further workup.

Possibly: It's possible that those symptoms could be from nerve damage. However, a peripheral neuropathy prefers the lower extremities and so i would expect those findings to be seen in your feet in addition to your hands. Other information that would be useful to share with your doctor include: paresthesias, numbness, imbalance, bladder problems, weakness, and past infection- guillain barre syndrome.