How can I fix my ipod touch screen?

So a month or two ago i dropped my ipod and the screen shattered really bad but it still worked fine. so i didnt bother to fix it. and it was fine. then i spilled chocolate milk on it (haha smooth i know..) and it was still fine. and randomly today it stopped working right. the touch screen is all messed up and everytime i try to type something the letters go all crazy like IHEOFINNWEENURCTIO3NTG3R2OI and yeah. idk what to do.