Mousie has hyperesthesia.
She has had a mild form for a while. The skin would ripple and stop. This was a major episode.
I am calling a vet who has Sunday hours here. I don't want her to suffer and any touch to her back still causes the rippling. That isn't subsiding.
I finally found some condition that matched her symptoms. She always has had weird diseases.
= new reply since forum marked as read
I've had cats for my whole life. Seriously, I don't remember a time ever when I didn't have a cat in my life, and thought I'd heard of or dealt with most weird kitty afflictions before. Mousie managed to find one I had never run across!
That it appears to be hyperesthesia is good news! It looks to be very treatable and not fatal. Both of which mean your (obviously) beloved Mousie will be good as new in no time.
I love a happy ending! There just aren't enough of those in life. 
I hope you got some sleep after posting this. It looks like you stayed up into the wee hours trying to fix Mousie. That kitty better appreciate you, because Mousie is one lucky cat!
I hope the vet can treat it, and give you some peace of mind.
Love to both of you. 
She used to have episodes of rolling fur, followed by running and licking imaginary things on the carpet. Luckily, she didn't bite herself, which is common.
She's 14 years old and rarely has any episodes now. If she does, I can break it by getting her favorite toy, a stick with a string, and play with her. I think it helps to shift her brain from the rolling fur mode to hunting mode.
I've also been brushing her at least once a day and perhaps this has helped to desensitize her. I sing her songs while brushing her and she enjoys it.
She has to gear herself up, so to say, before being touched, so I always let her come to me first and initiate touch before I pet her. This has worked out well.
Sending warm wishes to you and sweet Mousie.
