I have bad OCD about my health I itch all over with no rash, blood text came back normal internal med doctor does not seemed concern?

Don't worry. You did a good thing to check for physical causes. Since the expert is not concerned - you need not be. But I hear that you still are. So, you might seek an eval and Tx by a psychologist. If you are OCD, there are therapy strategies that help. Not easy, but effective. An eval is a good start. Best!