Is Shield that important?

[Ciclosfim]

Hey. Just reach rengol maps in game and now im suffering and burning hp pots to survive there.

Currently lv.50 but im not rich so basically my gear is legendary and so are my pets.

I dont have shield in my build. Tried to go full atk skills (fb, ts, ice, gale) but its now hard to survive as i said.

Passives and masteries are ok but my questions are:
1. Is shield that important for survivability?
2. Will shield save my pots?