This app, Calm Harm, helps you prevent self harm.
https://itunes.apple.com/us/app/calm-harm-manages-self-harm/id961611581?mt=8
It’s totally free, can be customized to your needs, and can even be made private with passwords and such. From what I’ve heard and my own experience so far, it’s really helpful!
Please get this app if you think you may need it, especially if the holidays are a hard time for you!