So sorry to hear of your father's sudden passing. Wishing you all possible solace and strength during this testing time. xxx
It both does and doesn't get easier.
I'm four years on from Mum's death in December 2017 - we had to wait over Christmas before we could organise her funeral. I still feel very sad from time to time, particularly in twinges in the middle of the night, and I still catch myself thinking for a moment that I should tell Mum about something that happened and then feeling so sad when I remember that I can't.
But I certainly do feel much more 'normal' than I did at the time, when it was just overwhelming. Five months after it happened I went away with my husband for his music weekend and I remember just sitting on a bench looking at the countryside and feeling oh so weak and so tired as if I just couldn't take it all in. I wasn't sleeping well, either.
But now I do feel that I can go on with the rest of my life. So it does get easier - or at least, one becomes able to press the mute button on Grief. I think the process is gradual, but I started to feel better two or three years after Mum's death as it sank in and I was able to accept what had happened.