A handhold from me. I too have a DD who has struggled with mental health issues throughout her teenage years. Self harming, considering suicide etc. I remember one night sitting on the sofa with her and I was on the brink of driving her to A & E because she was so low and nothing could bring her out of it.
Mine has anxiety too and anorexia. She was beginning her treatment at the Eating Disorders Clinic at around the same time as I was considering A & E. She didn't want to be taken there and agreed instead to give the clinic a chance, luckily.
Once treatment started we were very fortunate that she clicked very well with her therapist. She was started on fluoxetine and slowly began engaging with and even looking forward to the sessions. They became the crutch that really helped her out of the worst of it and she began eating better.
She is 18 now and has just gone to uni. She remains on her fluoxetine and is waiting for further communication from one of the student support nurses. She was sad to have to say goodbye to her therapist of the last couple of years as she said that her help had brought her back to us and had given her her life back.
I am obviously delighted with the progress she made. I am also scared again now because university is a big transition and a time of adjustment. I'm scared in case she starts to backslide and I will not be with her this time.
She's ready to move on now though, so I have to take that leap of faith too. Her university is only 20 miles from home though, so I know that if needed I could get to her fairly quickly.
It is so hard, and as a parent you feel so powerless. So, you aren't alone. I am no good at advising, but I can empathise.