Urge to cut nerve

The nerves in my right shoulder have been twitching for about 4 days now, consecutively..I have severe ADHD so the sensation is a sensory nightmare. I have been fighting the urge to just scar myself, open the skin there so the twitching stops. Either it actually will stop, or I will straight up paralyze myself from injuring my nerves. I know I shouldn't do it but it's really just a desperate attempt to escape a sensory issue. I'm not sure what to do or how to manage. A neurotypical brain likely would've blocked out the twitch by now but it's impossible for me..