Regarding extreme cracked heels and foot

Hello, This is about extreme cracked and chapped foot and heels. I am having this problem from almost when I was 15+ years. No matter how clean I try to keep my foot and do massage, apply foot care cream but it turns out in vain. I lost interest in maintaining the same. What is the health conditions that could cause cracked foot. Also at night I can't cover my foot while sleeping. If I do so during winters I feel like suffocated as if I  covered my mouth and nose. I don't know I get this strange feeling of like ventilated through feet which doesn't make me feel like covering it while sleeping. Any remedy please.. I am tired of it. They are dry and cracks that i have hurt my skin a lot of times while sleeping. Please help. Thanks in advance for those who could help me out!! Thanks for your time for the response.