Why is my cracked screen not working

Can you help me with my tablet problem ?...I was watching a show and it kept pausing and I got frustrated and hit the screen with my ha d and it cracked but it seems like it cracked u dee the screen .....and whenever I turn my tablet on I can't open it to my home screen ....when I turn on my tablet the screen stays on for about 5 secs and then the brightness gets lower ...can u help me fix this?