IPhone 4S no sound and flickering screen?

I have an iPhone 4S iOS 6 and yesterday by accident I left my iPhone for about 20 mins on the top of a box that has some water, I only noticed about 10 minutes after it got wet that there was water because my whatsapp sounded weird and I realised my case was wet, the screen was fine, and the sound was just very low and crackled but now after a night in rice the screen flickers on higher brightness and the sound doesn't work at all the buttons don't work, headphones work tho and my ringtone does but music/YouTube/text etc don't work, Help Please.

Http://m.youtube.com/index?&desktop_uri=%2F#/watch?v=HRgkjsck6Cc&feature=plpp

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