I really hope you see this! I had this SAME problem for a long time, all these different tests and blood samples urine samples, and so on, and so on. What about your toes? When you have a flare up, do your toes vary in temperature and color (pink, blue, red, white, purple)? This is a vascular version of Reynaud's Phenom. In addition, the dry and cracking skin IS an intestinal or absorption issue, not enough oils being absorbed into your blood stream. Also, I finally got the diagnosis of Lupus last year. Voltaren gel reallllyy helps this issue, and there are other medications that can help with the blood flow to your fingers. Hope this helps!!!