Fell down and the screen is blur and flickering

Hello there,

Am Bob, yesterday a friend pushed my phone from a table and fell flat on the s7edge screen luckily enough the screen didn't break but the display turned blur and flickering and i can do anything. There is a white cover that came on but the touch sensor is still working because i managed to turn it off. Is my phone died for good or the display wires were misplaced? I have been using it underwater since am a photographer but will it be advisable after replay to use it again under water? I really worried and i would appreciate any help from anyone who has been here or who understands.