I was recently going through writer's block myself and trying to push myself to write something, wasn't working for me. I continued to delete and rewrite, and I was quickly becoming frustrated with myself. The words just didn't sound right or make sense to me, and words were no longer flowing as easily.
So, I stopped and started another piece, often I would feel bad and question if something was wrong with my previous piece or if something was wrong with me.
But, I know that when I'm ready, I will go back and give it my best,and it will be great, for I could never completely give it up; it was my first creation, my first child.
It's a process and it can't be rushed, you may do more damage than good, so take your time, and rewind.