A couple weeks ago my bf accidentally hit me right on a nerve. It caused my whole arm to hurt and tingle, it finally stopped hurting after about a week and we haven't used that arm again. Well since then my arm still tingles when I use, but I have also noticed a new vein that's prominent but wasn't noticeable before. This "new" vein is located on my upper arm/shoulder. The first time I noticed it was shortly after I had used, my first reaction was to rub it and so I did and it was like I got a rush all over again. It does this every time now. I know it sounds crazy but it's almost like the meth is building up in my arm and then releasing when I rub it. Does anyone know what's causing this or has anyone else experienced this??