Hi Ali
My heart goes out to you and your family. Let yourself feel the emotions, do what you need to in order to get through this time. We are all here for you.
Here's what happened to my sweet grandpa, my dad:
I lost my grandpa as well, it will be 4 years this December the day after Christmas. He went in for surgery (hernia), We all knew if he was going to have an operation his chance of survival would not be strong because he had a heart attack years before which damaged a good portion of his heart.He developed pneumonia, it was the longest week of our lives. He was more than a grandpa, he did everything a dad would do for their child. He never put his needs first always others. I miss him so much. I made a collage of photos and hung at the funeral home and to this day it hangs on my wall.
I also made a video with photos to music of my grandpa, the photos have everyone in the family in various parts, it was my way of coping. Everyone copes differently. If at some point you would like to learn how to this I'd be happy to explain it. This was a great form of therapy for me. I made copies of the video and gave them to family members. My grandma is so thankful for it, she watches often. I even have a part with his voice on it.
My father in law passed away when he was 55 from a massive heart attack as well. Life is very hard Ali but remember all the good times, your grandpa knows how much you love him. If there's anything I can do please let me know. I want to reach out and hug you, tell you everything will be OK and it will sweetie, time is what you need and please give yourself the time to cry and laugh to reflect on the memories.
I was also given a poem by someone at the services, here it is:

Some things I would like to say.
First of all to
let you know I arrived I ok.
I am writing this from heaven
where I dwell with God above
There are no tears or sadness,
just eternal love.
The day I had to leave you
when my life on earth was through
God picked me up and hugged me and said
“I welcome you.”
Then God gave me a list of things I had to do and foremost
on that list of mine is to watch over and care for you.
When you think of my life on earth and all those living years
because you are only human they are bound to bring you tears.
Do not be afraid to cry it does relieve the pain.
Remember there would be no flowers, if there was no rain.
When you are walking down the street with me on your mind,
remember I am walking in
your footsteps-----
just a half a step behind.
And when you feel that gentle breeze
or wind upon your face,
that’s me giving you a great big hug or just a gentle embrace.
And when it’s time for you to go from
that body to be free
remember you are not going
but coming here to me.
I will always love you,
From my home way up above.

Many hugs and love Ali...

Summer