My iphone keeps turning off and on?

I have dropped my phone several times, none of those times was it something severe, but this time, i was on my bed doing my homework and i was reaching for a notebook when my feet accidentally pushed the phone and it fell, it was a hard fall, I knew my phone wasn't going to be ok, it fell straight up, so it fell on the speaker/ plug in side. When i turned it on, the screen was flickering, very noticeably, it then stopped flickering so noticeable, so you couldn't really notice it unless you really paid attention anyway from that day it turns on and off and on and off, i might be on whatsapp or twitter and it just suddenly turns off, and it does not turn on unless i press the upper button, i'm going to get it fixed this week but i just wanted to know what it might be? I think it might be the battery, *( ALSO FORGOT THAT IF IT DOES NOT TURN ON I CAN JUST HIT THE BACK OF IT AND PRESS THE BUTTON AND IT WILL TURN ON) so that's why i think it's the battery or some loose wire or so, help me out? Thank you! -sorry for the too much explaining, I always do that

Try and reset it

Well you dropped it multiple times so who knwos what damage you did

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