Sony experia z2 screen and microphone

Hello I recently dropped my phone into water, I dried it out with rice in a tub on a radiator, but now the screen seems over sensitive to the point where when I try to type with the keyboard it presses the keys next to the one I want and when I scroll up pages it selects the item my finger touches. So I’m not sure if it needs a new screen or it is just water damage and people say I am very muffled on calls so I think it needs a new microphone, is this something you can help me with? 
Thanks 
Stephen Rigg 

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