How to beat nasus top with Wuking

Ok here's the deal: I choose wu, go to top vs a nasus, i start harassing...but he has lots of sustain, so he simply ignores me and keep stacking Q, after a while, he comes back with a frozen heart and a stacked Q and starts towerdiving me, i use ult, juke hit him with everything but he just kills me and get out of aggro, then proceeds to push down my turret, late game, it proceeds to walk into my team and completely destroy them with his stacked Q and incredible tankines. I have several games just like this. Things I have tryed: Ignite, buying brutalizer, hydra, armor. My Wu is not that bad vs other champs, so I just don't know how to do something to prevent nasus to become a monster. Any thoughts?
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