Things you can do:
1. Get 10000 seals and reset your stats and go all Vit. By my extremely nerdy calculations you've got about 5 points in Vit? All Vit all the time!
2. Hit up market board and get:
Amber Ring x2 (HQ depending on price)
Amber Earring (HQ depending on price)
Amber Bracelet (HQ depending on price)
Militia Choker (HQ depending on price)
3. If you have a good bit of cash, get a HQ Aoelian Scimitar(sp?). You will eventually need to turn this in for the relic quest, so I bought it day 1 of 50 and used it till I got my GC promotions, bought the GC weapon and turned int the scimitar. Look up the name, I'm pretty sure that's not the correct name.

These few things will kick you up to 4300-4450 hp, which is enough for both dungeons, Ifrit, and probably Garuda(though you'll need to cycle cooldowns well during red line add).

From there, running AK will yield you shots at iLvl 60 armor and accessories, so I'd run that until you have enough drops to fill out your other slots with DL, then run WP for faster tome farm.

For HM titan, as a tank you have three options:
1. Buy a run
2. Start your own run, in which case you will want at least 5200 hp unbuffed but probably closer to full Darklight
3. Get incredibly lucky in Duty Finder