debugging and refactoring

Its Tuesday. I mean already Tuesday. I agree Mr seo. Developing speed should be faster. Why did the speed become slower. The code was complex from sometime. Debugging and refactoring are necessary and they take much time. In fact, in the last week, half of time was spent for them. It might be more. So, new feature implementation became slow. At initial time, I thought about only new implemented features. But nowadays I thought more about refactoring and debugging. And it make me so tired because something seems to be wrong. So, how can I solve this problem? At first, I should realize that this is normal situation. and I should be sure that the project is going well even if it's slow.