I have a severe addiction to strangling myself and I can’t stop myself. I’m only fourteen and I have brain damage. How do I stop myself???

I have been addicted to strangling myself to get high since i was twelve. I’m fourteen. At least 10 times a minute, and i’m completely serious. I often cause myself seizures and i have brain damage, I forget how to speak sometimes, and the other day in class I forgot how to write the letter e for a minute. I’m destroying my brain and it only gets worse. The worst part is, i cant stop because it’s my hands that are doing it, it’s not just like a vape you can toss away. I have to tie my hands together whenever i try to quit but i always get urges and do it again anyways. I have never, NEVER heard of anyone with this problem no matter how hard i search, Im completely alone. How the fuck do I stop before I accidentally kill myself.