Lily/ash, I would argue that not eating, drinking or sleeping is worse for you in the long run than cutting yourself (that's not an invitation to go back to cutting btw). Like, you'll really screw things over for yourself if you continue this.
Like you're not going to feel not miserable unless you start actually taking care of yourself. If you do want to suffer for some unknown reason you really should speak to someone about that because like I said it can get bad quickly and if theres still a compulsion towards sh (of any variety!!!) then that needs to be sorted out as soon as possible.