Phone turning off even with slightest bump

I dropped my phone accidentally on the floor my phone became dead and it won't open no matter what I do…So,I charged my phone and then tried…It turned on but shuted down after a few minutes..After the drop,my mobile turns off even with slightest bump…So,this kept going on..I opened the phone and checked if anything was broken or something…Nothing was noticable..So,I screwed the phone back…Now,It isn't shutting off but the slightest bump is still turning my phone off…

Note: I've been using this phone for 2 years and it never had any issues like this before..Dunno what ta do????