Help! broken iPhone Screen!?

I had dropped my iPhone on tile, and the screen cracked, not only that but now theres this grey blob on the screen and it covers up the bottom corner of it. When you look very closely at the screen there is a crack not on the glass of the screen but inside?? well the crack starts from the corner where the blob is all the way to the middle of my screen. every day the blob gets like 6 very small dots and then as soon as you know it, it becomes a grey line and the blob gets bigger. will it keep growing? it seems to be fallowing the crack/scratch thats behind the glass part of the iphone. I dont know if i should keep using it or what? and i DONT have the warranty on it any more. Is there any way to make the grey lines stop growing? Thank you.