How do you stop biting your fingers?

I know this question has been asked allot but none of the answers helped. I have it so bad, I chew my fingers up to the point were they start bleeding. There is not a second of the day that I don't have my fingers in my mouth I can't stop I tell myself that Im done but I continue doing it. My fingers smell horrible probably because they are infected or something along the lines of that. It's hard to type right now because there is a huge piece of skin missing from my thumb. I bite all of my fingers on after another after another, both sides of every finger, I even bite that tiny layer of skin on top of my nail off all the way. I swear it looks like I stuck my fingers in a pencil sharpener! I bite my fingers until nothing is left to bite and then while my fingers are healing I start to feel desperate and then I chew the skin off my toes and then as soon as there is a piece of skin on my finger again I bite it off. My fingers are in pain and that's not enough to get me to stop. I tried taping them up with band aids and duck tape and it resulted in me chewing it off. I tried nail polish remover, vinegar, and other bad tasting tasting things but the nasty taste still isn't enough for me to stop. Nothing is working and I desperately want this to end, please help me!