My wife's struggles

So I'm looking for some advise here, my wife has had a long history of mental health problems and she has been on a laundry list of various SSRI's, gone through CBT multiple times through the NHS and she continues to struggle, she used to think she had BPD as a mental health nurse mentioned it in passing years ago, other professionals have suggested possible bi-polar but the NHS just puts her through the cycle of, change medication, another round of CBT.... she has practically begged for some kind of escalation from her GP and her mental health nurse, she self harms, she's attempted and has voiced thoughts of that nature.... they just dont seem interested in actually helping... we cant afford private therapy... I'm just at a loss, I do all I can to be supportive, I encourage her to communicate with me and try and make our home a safe space for her... she goes through periods where she just shuts down and I really really worry... I just am at a loss of what to do and how to help....