Pls don't worries, the problem you said is common, and I often have that sense of that like you. Long time ago, I have just asked my doctor about the reasons why I feel like that. Now I know the reasons. As you know, there are some salts naturally in our tears, and your skin is dry that will result in some hurts( they are so small that you can not see them). And when the salts come into the dry skin on your face, the salts will make your hurts painful, and the pain just like your skin is burning. Of course, there are some ways for you to avoid the problem. For example, before you go to sleep and after washing your face, you can use some cream to make your face feel wet and it will not be dry. Then also, you can try your best to avoid crying, especially in winter. Thanks.