Probably a talents problem. You're missing the two most useful talents for a Prot Paladin - Ardent Defender and Judgements of the Just.
Ardent Defender is what "Last Stand" is for warriors in a way. An Extra Life. Without it, you might as well be a dead meat shield if you get slammed at, say, the last boss in Pit of Saron. He hits hard for one of his skills.
Judgements of the Just is your "Thunderclap". Reduction in attack speed is a good thing which means less incoming damage in the same period without said talent.
Remove Reckoning because odds are the extra swings don't count as much threat as you think it gives you. Plus it's a flimsy talent as well. Needs to proc to work. Might as well work on survival.
Otherwise, replace your Judgement glyph with "Divine Plea" and use it every chance you can get and keep it up. The 3% less damage makes some difference.
Healing is the source of life. Without it, you're left with death.