I have, especially over the past couple of months. I find that for me I need to walk away from writing, I tend to do something completely different. I don't get annoyed with myself because I think that makes matters worse. I will draw or walk my dog, just something to clear the mind and go back to it when I have.
I do read my book reviews, so far I am pleased with them. I know not everyone will like my writing style and I think I am prepared for that, but hey I'll probably cry at the bad and then move on.