Yes, me too but a a chiropractic nutritionist did a Hair Mineral Analysis and recommended nutritional supplements and now it is rare.
A doctor published an article on Medscape asking an interesting question about his theory on treating restless leg syndrome. He tried this himself.
https://www.medscape.com/viewarticle/999627
I have ET. I don't have numb or white fingers. I have a different finger issue called Dupetryn's Contracture, which causes my right pinkie finger to curl. It was diagnosed by a hand specialist. You might consult a specialist of that type, especially if nobody else with an MPN has the finger numbness and whiteness you mention..