The doctor does not help.After you restore light to the Dominion Rod,use it to move
the owl statue in the Santuary's(the first building you see when entering the Kakariko)
basement.Move it so you can get in.You'll see a huge cannon.Shad will come in.Go up to the cannon.When Midna's icon shows up call her out(very button for wii,z button for the Gamecube)She'll ask what you'll do with it.Tell her to warp.She'll tell you that she
can't because Shad's watching.Go talk to him.He'll realize he's in your way and leave.
Go back to the cannon until Midna's icon appear's again.Summon her and tell her to warp
to Lake Hylia.Go to Fyer(tyhe guy with tha cannon ride in the clown costume)and talk to
him.You need to fix your cannon and he'll do it for 300 rupees.Pay him and he'll fix.
Find a medallion in the cannon part that point's down.the medallion is yellow and red.Clawshot to it(with the clawshot of course)It'll shoot you to the City in the Sky.