Does not sound like you have kidney problems. The most common symptom as I understand it is edema. Your tests showed no protein in your urine ( if you had it the condition is called proteinuria) and nothing else has changed so it sounds like your kidney function is good.
If your pains continue you should mention it to your doctor. Pain could be indicative of kidney stones if your kidneys are the source of the pain. Don't ignore pain and see your doctor again.
Mixed connective tissue disease (systemic lupus, scleroderma, polymyositis), Raynauds phenomena, Hypertension, Barrett's syndrome.
Meds: prednisone (9mg & tapering), 150mg imuran, lisinopril 40mg, maxide 37.5/25mg, norvasc 5 mg, folic acid, potassium, aciphex 20mg, multi vitamins.
Maintain your optimism and you can beat the odds.
"Although the world is full of suffering, it is also full of the overcoming of it." Helen Keller