Practically brown urine....and my back hurts real bad.

 Thanks for everyone's ressponses. I called my surgeon right away and he said that I was most likely just not drinking enough water and shouldn't worry aboout my kidneys. I drank a lot of water yesturday and my urine cleared up.

I need to make sure I get enough water. It is a struggle but today I have a 50 oz water bottle that I WILL drink the whole thing.