Leslie, can't help but feel your pain. I wish I was closer to help encourage you or quilt a few of your tops. Would you feel less guilty if you gave some stuff away to a good charity group? They would love to have some tops to finish and donate, and always need nice fabric. Books can be sold on Ebay.
If I were you I'd keep quilting as long as I wanted to and leave directions in my will as to what to do with all of it when I'm gone. Don't burden yourself with guilt. If you are sick of quilting, move on. Or do some easier quilts. Very simple quilts done in your pretty fabrics can be quite lovely. Scrappy squares can be straight line quilted very easily with a walking foot. Quilts don't necessarily need an abundance of quilting. Sometimes less is better, as long as it's enough to hold the quilt together.
It sounds like you may just need a break. Is there something else you might enjoy for a while? Crochet, reading, gardening? Or try something completely new....