I am a mailma'am, and in the winter my hands look and feel like Hell. The dry air, biting cold, paper cuts, hangnails and cracking all gang up to make me miserable. Another thing that makes them crack is just being outside in the wintertime. At hunting camp, by the end of the third week, they are just plain scary. The cracks begin, get deeper, invite their friends, and I am miserable.
Last year a customer gave me a tube of Gold Bond hand cream, the one with shea butter in it. Regular use does wonders. Wear gloves as much as you can, it helps keep the skin from giving up the moisture. I can't bring myself to wear them to bed, though. Creeps me out. But it would maximize the effects of the cream.
You may also wish to review your exposure to various chemicals, solvents, latex, or other substances that you may be sensitive or allergic to, including foods, and see if there may be any way to eliminate exposure to such agents.
Killdeer