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.
Bill