Quilting a Quilt

I have been dragging out a quilting job all day. I guess because I can't see where I have been, because of the thread color, that I am just not enjoying this today. My back aches and my feet hurt and my eyes are tired. And now I found that the last four or five inches, I have to rip out. Something was wrong with the tension. And that never seems to happen. Why today,why me? I ask!!