It really sounds like you have done a lot of legwork in clarifying your relationship with and feelings about nursing. You seem to know who you are and where you might have gone wrong. You've learned a lot in your recovery journey. Awesome.
Me, I spent a lot of time thinking about what being a nurse really meant to me; how hard was I willing to work to stay in a career that is so very, very demanding? As it turned out, harder than I thought. In the past few years, I have learned so much about myself--which I won't bore you with, but the most important thing I have learned is to love myself. I know that might sound a little flaky, but it's essential. I think I was always seeking a sense of self-worth from external sources--by doing for others, by being a good little nurse, by never saying "no" and always trying to be perfect. But without a solid core of self-esteem, I just kept finding fault, always focusing on what I did wrong and how I should do better. I was an excellent nurse, but a lousy person--I had no idea who I was, but whoever I was, I didn't like her much.
But I've learned who I am. I don't have to solve everyone's problems, mediate every dispute, meet every need, or take responsibility for making other people happy or whole. I just have to be me, nothing more, nothing less. If I can spread a little sunshine along the way, so much the better; I like sunshine. If I brighten someone's day, that's great, but it's not my job to light up the whole world. I've learned to live with serenity, and I love it. That's been my experience so far.
Shame has its place--it teaches us humility. Hopefully, you have learned from your shame and left it behind, where it belongs. I know you will find your own light to share with others. Keep us posted on how it goes.