Sorry to hear that man. I lost my grandma like 6 months ago. It was simply horrible despite her being a very difficult person. All of my grandma/pa are dead, from both mom and dad side. Sucks. It's great when you have happy memories about going to the village where they lived (mine did), so it defo sticks with ya.
Still, despite knowing and "preparing" you can never prepare for that horrible thing. You think you're aware and ready, but it just comes and happens so fast and over night, gets you off guard, and it simply destroys.