My iphone 5s screen had shaking black, grey, and red lines?

In august of last year, I got water in my screen and the screen started randomly shaking and switching screens, as well as typing completely random things. It stopped doing that about two months later, but then a teacher threw it on her desk and it started acting up again. It hasn't done that in around three months, but then today I was riding my bike and had my phone in my waist band for about thirty minutes. Everything was fine up until I was almost home; my screen turned a light grey with multicolored shaking lines (the home screen, and just about everything else appeared to have a double). I got home and tried to back it up to iCloud, but it wouldn't let me open the setting to turn it on. The screen then turned a blackish grey, with red, black, and grey lines that seem to fade in and out. I've tried the "magic" restart method, but to no avail. I've also tried plugging it in to charge, but that hasn't worked. I heard that you can try to clean where the battery is to get out all the water and gunk, but I can't find the "pentalobe" screwdriver or a repair kit in any stores. Is there any way that I can fix my phone? I took a lot of pictures from a field trip I went on for my ecology club and my teacher wanted me to send them to him. I'm literally desperate!

You won't be able to repair the phone yourself. Since there seems to be a loose connection inside the phone, you can try giving it a swift hit on the edge or bottom (or top) to try and make the connection. It can't make it worse than it already is and it has worked for me on two different phones. If it doesn't work, you'll have to take it to a local phone repair shop.

Man, you should be replace the screen
One way taking your phone to the local phone repair store
Other is buy the screen online from Amazon or HCQS

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