hi,i've been using the belt facepulling technique where you fasten the belt to a pull up bar and then lean back and use your bodyweight as the pulling force but after a couple of weeks the left side of my neck was starting to hurt so i wrapped a sweater around my neck while doing it and the pain went away but now i feel the tip of my index finger of my left arm a little numb which i think comes from my neck..has anyone else experienced anything similar?