When I put it to charge it heats up pretty bad and quickly. I hold the power button and it still won't turn on. Any idea what's wrong with it?
That's a shame. It obviously stopped working - send it to Apple for them to repair it.
Are you using the stock Apple charger? If not, chances are that the charger overheated the battery. The excessive heat likely damaged some internal components. You'll have to take it into a nearby Apple store and ask for the Genius Bar.