Hi Hana,
I'm back! Was in Yosemite for the weekend leaving life behind for a getaway with my friend and my daughter.
Brown urine, could be blood or bilirubin but if it were bili, I would think it would have come on a little slower...mine turned ice tea like quick but pretty much stayed that way through climbing levels.
For kidney health...drink lots of water and cranberry juice helps (not the crappy kind with little actual juice in it). Dried cranberries too (although they have a lot of sugars), you can also get cranberry supplements and pumpkin seeds. I had horrible kidney issues as a kid and pumkin seeds are a little known awesome remedy!
Please see a doc that will thoroughly check you!!