Are we talking about willfull damage (i.e., I intended to hurt the patient) or an unintended accident? If the damage is unintended, there's no reason to feel ashamed. Embarrassed, perhaps, saddened, certainly, but everyone makes mistakes, and someone who claims to have none is lying.
What I have found is that nurses are much harder on themselves than any other professional group I've seen. When our physician colleagues make mistakes, they do what they can to rectify any damage, and usually go on and live their lives. Only nurses seem to think there's a scarlet "m" (for "mistake") plastered on their forehead for eternity.
If you make an honest mistake, what's the big deal? Correct what you can, apologize for your error, learn from it, and go on and live your life. People who don't make mistakes never do much of anything.
Jim Huffman, RN