My iphone 6 has gone black and wont turn on

So 2 days ago, my phone suddenly goes off and has a blank screen. I leave it for a bit because it was kinda feeling hot so i leave it to cool off for 30 minutes. I then leave it on the charger for the night because i thought it ran out of battery and when i tried to force restart it again in the morning, it would turn on for a few seconds and turn off again. sometimes it doesnt even go to the home page, it sometimes reaches the apple logo and goes black. after 2 days of trying, now it has just gone black. I can still see the screen light under the actual screen but the phone has just gone black. it also keeps getting too hot everytime i try charge it.

Please help!!