Cheryl, I have Sjogren's Syndrome too, but my doctor said that what probably also contributes to making my hands (and feet) so dry is Raynauds. My fingers are so dry in the winter, and even in the summer when it's quite humid here. I keep super glue handy to glue serious splits in my fingertips (a tip my fire-fighter brother and nurse son gave me.) I use a paraffin bath for my hands (works for feet, too.) Bought it on Amazon pretty cheap. It helps to soften the skin. Oluwa's advice about pumice stones, and big emory 'paddles' for your heels is good - I use them in the shower, along with a good moisturizing foot scrub with pumice in it (I use Body Shop brand, but there are lots of others.) I don't touch water without gloves on - I keep a pair in the kitchen and in all the bathrooms. Absolutely NO cleaning without gloves. And I put a heavy cream on my hands before I put the gloves on - helps to soften them up while I'm cleaning. When my feet get dry and cracked I put gooey gobs of a good foot cream on at night and then put white cotton socks on (not very sexy, but....) Hope some of these ideas ease your symptoms.
"If you trust Google more than you trust your doctor than maybe it's time to switch doctors."