ahh the curse of the UA lock. The utlimate glass cannon.

From the sound of it, you are VASTLY undergeared than what you should be even as a fresh 70. But that is a good thing, getting geared up these days is easy enough. Just hit the BGs. In AV Especially, you will shine. Like others have mentioned, I would go Felguard spec until you get better gear/more resil. Felguards and dots would have been more than enough to kill the druid in your situation.

UA is VERY powerful once you get geared, at 1k spl damage , one row of dots kills most targets without heals. with 4x locks and 1k spl dmg each, UA and SL alone will kill everything you face.

To survive in PVP as a UA or destro lock you need at least 450 resil. I speak from experience on this. Until then, get a felguard spec, hit the bgs.