If your toon got just a bit of gear, it wont die. Blood is way slower than Frost for leveling. And to the CC question, Singular works great.
I just leveled a DK all the way to 85 with the singular cc. No heirlooms or anything. I went blood spec from the beginning to the end, mostly questing and a few runs in tanking in dungeons with instancebuddy. Using blood spec, i wasn't the fastest killer in the world, but i pretty much never died
Went with Blood for levelling as I could get fast queues for Instances that way, dps queues suck on my server.
lv 78 blood so far using singular, went 70-78 mining/herb sholozar bashin or whatever, and mobs didnt hit me for more than 5% hp lol..