Lupus is rarely easy to diagnose and shares symptoms with other diseases. This is the nature of an autoimmune disease and diagnosis often takes time. If you are not satisfied with your rheumy get another opinion but find one who is experienced treating lupus and other AI diseases....not all are.
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.