My phone refuses to come on.

Yesterday my iphone 5 fell flat on the ground on its back. When i picked it up it did not come on. When i got home i tried to charge it but the battery sign keeps flashin on and off and there's no sign that it is being charged. I also tried holding down the home button and the power button and it says connect to itunes. When i did nothing happened and it still isnt being charged. Is it the end for my precious phone? Do i need to change the battery? What could possibly be the problem? Ill appreciate any type of help what so ever, thanks.