There's no possible reason for you to lose 6k health. Something else contributed to that change beyond the patch changes. I am a Ulduar geared Blood DK, and I stacked health for days, I got the biggest health break you could possibly, and I only lost 3k or so in full raid buffs (also, lost 2% dodge and gained 0.5% parry, but I wouldn't generalize that to your stuff, there can be quite a bit of range).
As for your specs:
First off, I'm not sure why IBF is somehow mysteriously worse than it was, they simply cut your maximum possible uptime in half if you used it on CD. It's less available but otherwise it's the same powerful protective CD it always was. The spec itself, this sort of thing has been around for ages, and personally, I think you sacrifice WAY more than you gain in net value. Let me be more specific:
Vet of the 3rd War is nice, but +3% Stam and +6% Str are not THAT big a deal (note I leave out the Expertise because you give up Tundra Stalker to get it). Spell Deflection is nice, don't get me wrong, but is it really worth the relative gains you're giving up in Frost? You also took Butchery and Scent of Blood which are nice for buffing your (weaker) Frost Strikes (for not having Tundra Stalker at +15% damage). You didn't even take Bladed Armor which is a MASSIVE amount of AP for a tank in Frost Pres. Dark Conviction, as much as I like it, is not value enough for a tank to carry it's weight in the Blood tree, but that is mainly just a stepping stone for you to reach the talents I commented on above.
In Frost, what are you losing? Well, you've buffed your 2h strikes from Blood, but you've forfeited 15% crit chance on Oblit (think 15% damage from that talent alone). You've sacrificed Tundra Stalker that is worth 15% damage on everything you do, which is slightly more than 15% threat (when you factor Rune Strike). Losing Howling Blast is also a very big deal, even to a double-disease strategy. HB on it's own is fine threat, but when you factor that Rime gives Oblit a 15% chance to proc a free Howling Blast, that's a major damage loss. You've also sacrificed Chill of the Grave (strong amounts of RP in a deep frost build) to dig into Blood. The bonus RP is not just additional FS's, it's some nice small bonus threat as well.
In short, I think you're losing out more than you gain, but bear in mind, you're likely gaining survival value at the expense of crippling your threat. That's a balance you are welcome to make, but I think when it matters, you'll rather you had the threat than the lesser gain in survival value.
Ravenous Dead is not a bad idea to take, but I wouldn't take it thinking of parry. In my gear it amounts to about 0.05% parry per point, in late Ulduar gear. The buff overall is not a bad one though for threat and avoidance. Again, you are losing A LOT LOT LOT from not having Bladed Armor. To give you an idea, you have what, about 29k armor in Frost Pres and buffs? That's 161 AP per point, or 806 AP for the full stack! That would be a 33% increase in your total AP. That trickles down into everything you use for threat and quickly becomes one of your most valuable threat talents.
Be aware, Butchery is terribly under-whelming in raid tanking. How often do you get a killing blow to trigger the 20 RP gain? And the steady trickle is a much much smaller value than even 1 pt of Scent of Blood (if you're particularly interested in RP, Blood doesn't need it much). Bloodworms is terribly underwhelming come endgame as well. The healing does not scale very well, and the worms do not position well so their parries can trigger boss haste and cause more damage than they heal.
Here's the part that really dismays me. Heart Strike!! This is a MAJOR ability for Blood. It replaces BS with far superior damage, and it gets buffed so very well from talents. Using DRM (which you don't have) you can convert FU pairs into death runes, and spam HS's (or still use DS if you need the heal) buffed by Subversion crit rates (which you don't have), and maintaining stacks of Bloody Vengeance (which you don't have) for a solid 9% overall physical damage buff (slightly more than that, though it doesn't buff non-physical damage it plays very well with RS).
Forgive me if this comes off rude, but your understanding of your class doesn't seem to even come close to approaching your gear. Not even slightly.