you will die very fast, if you dont want to rely on peels (which you def should), your best bet is to frostshock or earthbind the dk and attempt to wolf around some form of LOS, look to dispel the chains root quickly as it will provide with a free heal as you are running, helping with the NS issue.
Overall any deathknight with a brain who is left to sit on you will most likely kill you quickly and if not force the majority of your cooldowns. Look for peels! and once you get around the pillar stay opposite of him, i tend to mount up just to be that much more of a faggot until they get off of me
Best of luck to you!