i am sorry that you are decompensating so quickly. is it feasible to wear camisole/panties or long slip while you were showered claiming shyness and they could reach under to wash you and limit your cutting to what this material covers.

in the meantime, if you want a suggesting regarding the cutting there was a book I bought called the scarred soul. you can get it on amazon for under 10 bucks. its a work book of sorts to understand si. read a chapter answr 8 or so questions. it was a nice book as in it wasn't threatening to do. it didn't ask you to quit which was a scary idea for me. I wasn't ready to do that. it doesn't ask you to do that till the end of the book. I quit doing the book at that chapter because I wasn't ready. but I didn't cut for over five years after doing the work in the book. then I only cut twice during a complete mental breakdown. it has been nearly 8 years now since then that I still haven't harmed myself so something about the book worked even though I never finished it.

good luck and take care.