MacBook acting weird after it fell / I dropped it

MacBook Pro (Retina, 13-inch, Late 2013)

Serial number: C02M33GKFH01

Model: A1502

but using Windows 10 with Bootcamp

Mexico

Sorry for the long story/post, but I need help, PLEASE help me.

So I was finishing taking class (Software Engineering) and I was packing my stuff and my Mac fell off along with my hdd from my desk (it is a little bit inclined), like from 60 centimeters away. It was already off and friend of mine almost saved it, but it still got hurt :(

The HDD survived, but when I tried to turn the Mac on the screen didn't. It made the typical Mac sound and the keyboard was on, the thing is that it was acting weird because the caps lock wasn't responding properly, nor the sound and keyboard light buttons.

Every time I tried to boot it with an external screen only the windows logo appeared, but then some seconds later the screen turned black and nothing happened.

I restarted PRAM or as some know it, NVRAM (Cmd, Option, R, P) and then Apple logo appeared on screen, after a while it took me to the choosing language and password reseting screen, so I just used the Apple menu to choose the booting partition (Windows)(Still acting a little bit weird, i noticed some kind of lag on the keyboard and the image got sometime strange, like if there was interference). At this point the screen turned on but still black. I disconnected the external screen and when I turned it on again the screen worked but this time it just made it to the screen where it starts loading my profile but again the screen went black and nothing happened (but the screen was still on). I decided to take it to an Apple fixing local near my house (No Apple care and no warranty left, plus it was dropped) and when the guy tried to turn it on, it booted perfectly on windows, like if nothing had happened.

He told me in fact the screen, some flexors and the inverter (don't know what it is) got damaged, but not that much and that they will be still working for some time. He said the logic board and everything else looked fine.

I used it perfectly like for 2 weeks but then it happened again, black screen (but turned on). I restarted again PRAM but it didn't work, just made it to the Windows logo. Restarted SCM (Shift, option, cmd), still the same. Had to Restart PRAM several times to make it work. It took me to the OSx part where you have to write your password. I did, but when it tried to load the OS the laptop started acting weird again and went to the black screen again. Did the whole proces again, but this time I used option+on to choose windows partition. First it loaded this

(It looks windows didn't load properly)

Irestarted it and used it for a little and it still was acting a little crazy. Rstarted again and now working fine (writing this with it).

Please help, what could it be? Is it possible to have software problems from taking a hit? Or maybe the guy who checked it couldn't see the affected piece?