Welcome to NeuroTalk!
Double vision got me my MS diagnosis, too. I also have had a numb right hand for several years.
It's hard to explain how something that's numb is also painful. I have tried keeping my right hand and arm warm. It helps sometimes.....other times it doesn't. I really do't know of any treatment or remedy for numbness pain.
Has your Neurologist suggested anything? My numbness has gotten better over the years but when I'm in a flare up or sick it comes back with a vengeance.
Hopefully someone here will have a good suggestion.