Hmmm...that's a tough one. My first very intelligent tip would be of course to maybe NOT smash ur iPod as hard ad u can? Maybe that would work! Or how about going to Genius's-R-Us and picking up a big case of common sense. If this doesn't help I don't know what will. Good luck! ;)
You should look up anger management classes as soon as you take the shard of glass out of your foot, thoroughly cleanse the area and apply antibiotic ointment and a butterfly bandage if it doesn't require stitches and a psych consult. Have a nice evening.
Go to the hospital. You could try pulling the glass out yourself but if it shattered any they'll be little pieces left behind. Learn to control yourself please. I have a son who destroys almost everything he buys. If he only had the money he wasted replacing items.