I know someone who booked herself into The Priory (in Cheshire).
Some of the things she said about being there are, they were very kind, and the atmosphere was very calm and quiet. She was a bit surprised that she wasn't allowed to lock her bedroom door, and iir, there was no lock on the (ensuite) bathroom door. If she shut her bedroom door, as I recall, she was required to hang a towel over the top of it, so it wasn't fully shut. I think this is so that no-one can have the privacy to harm themselves.
The room she had was like the rooms you get in a Travel Lodge. Basic, but comfortable.
I don't think it's cheap, but she didn't stay there for very long, only about 3 or 4 weeks, and she then went back to see the psychologist/ counsellor regularly as an out-patient.
I think it gave her the space she needed to clear her mind, and I believe the practitioners are excellent.
I think if you can afford it, it is worth trying for a place like this, as the intensive nature of the treatment is more likely to have a lasting benefit than trying to get better with an hour a week of therapy and 'real life' in between.
Hugs for you, mulranno. I hope you find a way to recover.