To treat the coldness in your fingers (finger numbness) the following plants are useful:

cayenne pepper: add a bit of cayenne pepper in some (any) herbal drink. This drink should be taken especially when leaving the house. The cayenne pepper has a soothing effect on the body, it returns its energy and vitality;
cayenne pepper
ginger: drink ginger tea or in any herbal drink add a certain amount of ginger powder. It can also be prepared a lukewarm bath in which is put a ginger powder, and the powder can be placed on cakes and other foods.