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My phone started flickering one week after i dropped it but it worked fine until after two months it suddenly stopped and a black spot came and the screen start flickering and would only stay on for a few seconds. i am still able to unlock it and swipe down the home bar. I have not dropped it ever since the initial drop. what should i do? should i buy a lcd screen or lcd digitizer?

The screen needs to be completely replaced as a assembly. LCD digitizer sounds like just the glass with the touch screen layer, this is only useful if you are replacing just the glass while the display is not damaged as a professional refurbisher. LCD screen is what you need as both layers are damaged, I’ll link you the replacement part and guide so you know what I am referring to: Galaxy S7 Edge Screen The replacement screen is fairly pricey so I recommend looking around locally in your area for anyone that does screen replacement on the S7 Edge.