glucosamine is good shit.
Here's one that might save you some doctor bills.
If you pee blood due to a kidney shot treatment is really easy. Drink TONS of water and piss as often as you can, it may seem gross or scary, but it won't make you bleed anymore than you already are, and keeping it in could give you a clot. Try to get a lot of bedrest, and stay kind of reclined, this will put less pressure on your kidney, allowing it to heal.
If you hit your kidney and can't pee, or if you start off pissing blood and then stop peeing, go to a doctor, you might have a clot in your bladder or urethra or something, which is serious and needs medical attention immediately, they'll probably give you a catheter. Before you go though, try to drink a ton of water and stand under the warm show for a while, you might be able to blast the clot out.
Besides that though, kidney shit is pretty easy to remedy at home, and if you don't have insurance it will save you a ton of money iin shit like catscans or other imaging stuff. If you do have insurance, you can go in and they will tell you pretty much what I told you, give you some mri's or whatever, then force you to stay there until you pee in a bottle, but in the end, if your doctor is anything like mine, they'll give you as much vicodin as you ask for.