Wow, Disc Priests Don't Die!Follow

Title says it all, but I signed up for the Arena Tournament thing, and I've been making classes I'm interested in (obviously).

Well I made a Disc Priest, and I dueled a rogue...and I easily outlasted him by DoTing him, HoTing me, pyschic scream (an occasion Greater Heal), a nice PoM, and I'm good to go at never dying.

Duel a Lock, and I do the same thing.

We're obviously really powerful at not dying, however I noticed one thing I suffered from was spell pushback (especially pets), and I'm worried when a hunter gets to me what I'm going to do. Any tips to counter this? Shield is great, but only so great.