Hi SnackJack, just wondering if you have anyone in real life who is helping you be strong about this. Do you have a reliable partner or a good friend.
To do the tough love stuff YOU will need lots of support and help to keep yourself strong and sane.
I had completely different issues with my 2 dds: dd1 was quiet, hard working, eager to please, but was also depressed, withdrawn and self harming; dd2 is gregarious, outgoing and unworldly, but loves to party and will lie through her teeth to get her own way.
I doubt I would have managed either without the support and good sense of my wonderful partner, the listening ear of my sister, and the wicked sense of humour of my best friend.
When dd2 had a wild party in our house (age 15), we did the tough love stuff. Took her mobile phone away (she was really, really mad about that), stopped from using the computer, and grounded her totally for a month. I was worried that being so tough she might rebel totally and run away, but we got through it. I told her frequently that we loved her deeply and always would, but that we were angry and hurt by her behaviour. Don't know if telling her made any difference, she thought we hated her, but at least I knew I'd told her I loved her. During that time in particular, I tried to ignore the "small stuff" like untidy bedroom etc, otherwise it would have been constant nagging, and I tried to make positive comments whenever I caught her doing something right, e.g. Thanks for emptying the dishwasher; Your hair looks nice today; I like those shoes; etc.
It's tough having a child who is potentially ruining their life (as well as making everything horrible at home) but often I reminded myself that I was so glad that dd2's problems were better than dd1 where we were concerned about suicide.