glass...i'm not an alcoholic, but the soles of my feet feel just like that when.......awwww, never mind.....can't go there.
seriously.......i am type 2 diabetic, diet controlled....off all meds now, thank goodness....but my feet can feel just like you described. just a slight vibration, tingly...but ever so slight....not painful...not numb....just kinda soft buzzy feeling.