GAH! No Linky makes me sad panda because that makes me wanna have to work more >< Lesse here.
The World of Warcraft Armory
First thing first: ...Atomic Kittens? Really? lmfao
Ok ok, seriously..let's see here.
Your gemming is fine. You're gemming for health which is fine and dandy to be honest with ya. It'll give you a small cushion to relax on. You're a bit low on health though, which is strange. 27k seems to be something you'd wanna start in Naxx gear if I can recall. I thought I started Ulduar 25 with around 30k fully buffed. I could be wrong. Anyway..
You seem to have a mash of Naxx 25/10 as well as a couple of Ulduar gear. I don't see the problem gear wise either so that can't be it.
You're way over the defense cap so it's not a crit issue either.
Enchant wise, your shoulders are missing an enchant, not gewd. Get Hodir enchant. Otherwise the rest are fine.
Short of a log, unfortunately, at this point, I cannot see anything really that was your fault. Shoulders aside, you're strong enough. Maybe your healers were casting while a Jet Flame went off and got interrupted and couldn't heal you. Communicate with your healers and find out what's going on.