Hi op, I've been in this boat, it sucks so big hugs.
I would hope that my dc's event was a cry for help rather than a true attempt to end life, however I will never know, but we were so so lucky it didn't work. It was a bundle of triggers, anxiety, scholl, a unknown at that point diagnosis of autism. There had already been self harm issues but this just ramped up, it was in Y10. Again, similar in that the attempt didnt work and we were notified by school Monday morning they were sat in pastoral where this had come to.light that the attempt had been made the previous evening.
The hospital were goid, we were discharged with a crisis referral - a crisis team.person came the next day and they put a referral in to a support centre - that took 11 months to cone through. We arranged private counselling but it didn't do any good.
There are lots of standard checks made by support services just to make sure ypu and your dc are safe, well and have support ir it can me arranged (unlikely to be any time soon though).
At the time they had the huge ikea cabin beds with desk and bookcaae underbeath - while I was at the hospital dh went home and took it apart so that on a night we could peer in and check in snd lay eyes in dc in the night.
Knives, scissors, pencil sharpeners etc all got tucked away, and school had regular check ins with them.
It's a rubbish time, just keep communication open with your dc and with family, friends and services so that there is support for you both.