however, I do know that even a slight increase in testosterone
levels in men will cause increased acne
, oily skin, rapid hair and facial hair growth, anxiety, irritability, etc... This will also cause muscle twitching. Just a guess, but maybe the unrest you are feeling in your hands and legs/feet are caused by the testosterone increase; thus, creating more irritability.
As far as the grey hair...I turned completely grey when I was 17. Sometimes that is a genetic thing.