Protein in your urine is called proteinuria and can be caused by lupus. It is usally treated with an ace inhibitor like lisinopril and is not a condition that should be ignored because it indicates you have kidney dysfunction.
Find a doctor that will take you seriously to get a diagnosis of what is causing your kidney problems.
MCTD (lupus, scleroderma, polymyositis). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, Barretts esophagus, quadriplegic in 2005. Recovered and now active in skiing, tai, chi, hiking, golf. Meds: prednisone 2.5mg, imuran 25mg, amlodipine, benazapril, omeprazole, potassium, folic acid, vitamins, maxide and various supplements and vitamins.
Remain optimistic and you can overcome the odds.