I just had a c-section 2 weeks ago, and I don't think the challenges you are having should be happening. Please see a Dr. and get checked out. It's important to not ignore it. By the way...you are my hero walking an hour after surgery. I thought I did well walking 12 hours later. 1 hour after I was still pretty frozen. You are one determined lady!
The lack of feeling might be that they cut a nerve, and the darkness in the urine could be something totally different (if it gets the color of Coca-Cola, for example, it could be a sign of hepatitis). I would definitely go see the doc and explain what is going on.
I realy think you need to got it check witha doctor. I would take a mid stream morning sample with you when you go that way he can at least stick test it there and then. I am sorry but it doesn't sound normal at all to me. Hope you can get it sorted soon it can't be very nice for you.