I’m on a line here, but I think it needs saying. Thoughts of ‘self deleting’ via a chainsaw, to them, may come across as unrealistic. I’m not saying those thoughts aren’t in your mind - you’ve stated it enough that it is. To hurt yourself with a chainsaw is something that would require that much self control I don’t know if it’s possible. I’m not in your situation though.
I think you need to not say things like that. They may deem it untrue. Present yourself at as many places as you can and show your desperation for help, not self deletion as you put it.
I hope I’ve worded that as carefully as I can. You are clearly in need of help. I just don’t think those words will get it. Keep posting.