I didn't know the name of why my fingers and feet would get cold when the rest of my body was fine. As an adult I learned it was called Reynaud's. I had to wear warm gloves in the produce section of a grocery store just to pick up the chilled and wet veggies. My hands, once the blood drained out were painful and needed hot water or a microwaved cloth to warm up again. In winter I needed a heating pad kept by my feet in my bed as no amount of blankets could warm up my feet once cold.
I read that fish or krill oil could help.
In my early 70's my condition improved dramatically after I had been taking the fish oil or krill oil capsules for about 2 years.
I've also read that their are some of us born with it and for others it happens later in life and may be a symptom of other diseases. In my case I was born with it, so I don't know if fish or krill oil will help the second type of Reynaud's