I need serious tips against Fiora.

I've got absolutely no idea what to do against her. She feels like Riven, aka, she's in URF mode while other champions arent (Low mana costs and close to no cooldowns) I was playing Nautilus tank, and she tower dived me at around 35th minute. I was like: "Meh, I'll just ult her and she's gonna be dead thanks to turret" But what actually happened: http://puu.sh/kMErP/e80c12b7bb.jpg Riot pls.
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