Help from self injurers?

ive been a self injurer since i was in the 7th grade. i started off digging my nails into the skin, to biting, to scratching, cutting, headbanging, punching, pulling at skin now all of the above. even now i do really bad things like be really promiscuous, or i provoke those who hurt me to add onto the pain im already feeling just make things worst u kno. ive always been okay with it, it got me through whatever i was going through but the last two times i did it, it had no effect on me. i didnt feel better and almost worst. im kind of afraid because now i dont know what to do to take the edge off when im going through my problems. im afraid i might do something worst. i want to get help, maybe get meds. like some happy pills i can pop when i get down but i dont know how to go about it. i dont know if self injury is a disease or mental health issue and if it is what its called and what or how they treat it. i know i liked self injury it made me feel better after, at least for awhile. now i dont know what to do. i feel down, angry, irratable,self hate, or just numbness ALL the time. i havent felt happiness since i was 14yrs old and that was a brief moment in time. i just want to be normal. i just get really down and out for no reason out of nowhere. things will be kind of okay then out of nowhere i'll just go through these down spells. maybe 2-3 times a month or more sometimes. nothing will even trigger it. i dont know what to do or where to turn. any help at all will be greatly appreciated. make another method of self injury i havent tried that works better