I play a lot of mages/enchanters, so I understand the pain that Zed can bring.
That's why he gets 90% of my bans. His normal pressure is not hard to deal with, it's just annoying that his ult requires specific counter-play and it's almost a necessity.
Communicate with your team. Let them know the Zed is going to be gunning for you every team fight, because he will if you're a squishy hero, and if your team is decent, they'll play around that.
So, it really just boils down to accepting that he's going to rush you every team fight, you have the proper items, and your team is aware of what's going on and helps you counter him.