Lupus often attacks kidneys (lupus nephritis) so it would not be unusual when having a flare that it would affect kidneys and produce other symptoms as well. Raynauds is usually secondary and often accompanies lupus, scleroderma and other AI diseases.
Both conditions were part of my disease but I have been in remission for 8 years. Kidneys are ok but I take meds and my raynauds has pretty much disappeared.
MCTD (SLE Lupus, polymyositis, scleroderma). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, barretts esophagus, quadriplegic in 2005. Recovered and now active in downhill skiing, golf, hiking. Meds: amlodipine, benezapril, omeprazole, potassium, folic acid, vitamins, maxide.
Remain Optimistic and you can overcome.