It could be that you have some kidney issues that the colloidal silver is addressing, but I would not rule out some kidney stress in the event of large amounts of large particle high PPM silver.
What kind of colloidal silver are you taking? What is the PPM and how much are you taking?
Ever try eating large amounts of watermelon for your kidneys? It is great for cleansing and also gets rid of kidney stones. Do a one day fast of eating nothing but watermelon and eat all you can and you will find that it cleans out more than just the kidneys! Keep the toilet in close proximity.