I empathise with you as I am also in a really dark place at the moment. I am also a cutter like yourself, my family, Drs and my Psyche team tell this is a really bad thing to do, HOWEVER, the cuts I make are superficial and heal in a few days [but they do leave some ugly scars for a while] the emotional well being I get [albeit short lived] keeps me from doing something more crazy.
Please note I am NOT telling you to cut or harm yourself in anyway, just that I know how you feel.
Have you tried writing your feelings down? I have comprised quite a collection of "dark" poetry as I call it [I have trouble verbally expressing my emotions
] I must admit most of my writing is just scribbles, sometimes comprising of just a few words, but I find that it also can divert some of the "dark" energy that builds up inside us, by dark I don't mean evil or anything like that, just unwanted or harmful energy.
I do hope you feel a little better, I'll leave you with a quote, if you do nothing else today why not have a think about its meanings?
"In pain there is life, In darkness endless strength, look to the night and learn these lessons well"