Yep, plants in eastern NC are looking bad right now. I had a low of -2 degrees at my house and wind along with it. See my post from March 2016 for description of the different types of winter injury. Right now, we are seeing results of desiccation on evergreen plants but as spring approaches, I am sure we will see bark splitting as well.
So what should we do? First of all realize that, in most cases, plants will recover. There will be some death in marginally hardy plants but there is really no way to know that yet. Until new growth appears in spring we will just have to look at a lot of brown. In many cases, this is just foliar damage but in some cases, there may be stem/branch dieback. To check how far back on the plant this goes, scrape the bark with a knife for green under the bark. It’s still winter so I would not prune until March as pruning stems back now could expose the plant to further injury from any cold spells ahead.