Dudu, it's not easy to just erase everything you believed to be true.....It's like starting your life all over again, minus the guilt which has been so deeply ingrained. When good things happen, it's like a hollow victory........
I am often too afraid to be happy in case I become sad, afraid to accept any good things that come my way as I feel I don't deserve them, afraid to reach out in case I am rejected.....all from a life time of training.
As the others have said, go easy on yourself and expect to climb those steps and then take a few backwards again, it's all part of the process. Professional help is a good idea but make sure they understand otherwise this can make you feel worse.