Cat mowing and chewing until skin bleeds

So I think we've finally found something that fits the symptoms. Unfortunately, it's a poorly understood condition called Feline hyperesthesia. The start of this video is pretty indicative of what our cat has been doing.

We've got her in a cone (which has limited how much damage she can do) but the diet change hasn't stopped the ticking or attempts at self-mutilation. Still, it's good to know what this is, in some fashion. Thanks for all the comments.

Just going to add a few words to the Feline Hyperesthesia

My cat has this problem since I know her (about 10 weeks old). When she got 6 months old she started showing symptoms of back twitches. She would look at me as if I am doing something to her back.. then run around the house to get rid of something on her back (imagination). Then after 1-2 min sit somewhere and start licking her belly. She would chew spots around her nipples (probably higher sensitivity) and damage her skin.

I have tried, changing food, changing behavior, feline calming diffusers sprays, topical skin care agents, anti allergy medication. I am not yet certain about using steroids and psychotropic agents. I am trained in medicine and I think that it is not at that point yet.

About the cones that you mentioned. I tried using a cone on my kitty and the poor soul was more stressed and unhappy with the cone compared to the pain of actual licking herself raw. SO just make sure that you are not stressing the 12 lb soul even further. Usually these things dont create too much of an issue. They come and go in phases of damaging and healing.

I'm having same problem. It is dry skin, dandruff. Try cocoa butter lotion or vaseline, it's the only thing that worked! She was itching, scratching off fur and bitting off her nipples. Please try it because your cat's condition is concerning me and it's sad.

Our cat had this problem with pulling, biting and licking his back. We had steroid injections, anti-inflammatories, etc. Nothing worked. He’s 16 and his mobility has been getting worse, but we put this down to old age. A few days ago one of his back legs started kicking out. I took him to the vet and they checked his blood sugar among other things. Turns out he’s diabetic. He’s been on insulin for a few days and has vastly improved. One of the early signs of this is twitching and pulling/licking of the back along the spinal cord. Wish we had known this earlier. I’m posting in case it may help someone else.