It happens. Sometimes it gets worse when you keep thinking you should do it. Happened to me right after my Dad died, and it happened again after some major personal things.
I did something else - not quilting related. I have a great sewing area, and a lot of fabric, but I just couldn't "get into it" And I found that when I tried to do it, and my heart wasn't into it, nothing went right. So, I did something else, went out for a walk, sat on the QB all day, watched a movie, did something, anything but sewing. And one day, BAM, I wanted to sew again.
It happens.