Scrap time

I am working on a contemporary fiction and hit a brick wall. While I was sleeping I had an idea, and in order to make the correction I basically have to scrap the current format and start over, keeping elements and certain passages of the current work. ARGH! Have you ever had to totally revise a work that you are a quarter of the way into? Frustrating, but in the end, it will create a better flow. I feel like I have wasted almost a month but I have to revise to get it right. A delay is tough, but not being happy with the work is worse. Off I go, red pen in hand and (ouch), cut, cut, cut.