Blessing of sanctuary and holy shock worked well for me. Sanctuary all the way till SM was gold. Holy shock obviously for the insta-heal.

Also if you have the block trinket from shattered halls you are GOLDEN all the way to SM.

http://thottbot.com/i27529

With about 50 mobs on you - you will simply not die with them beating on you.

I would even go so far as to recommend running a few SH runs (regular) to get this trinket. I got mine on my first run (lucky) and wow did it ever make a difference in ZF. Until SM you probably wont even need it but for SM its GOLLLLLDDDDDDDD lol.