I truly cried when I read this. I am so sorry. It brought back so many memories of my Mom's death.
I'm sorry your Mom snapped at you. I'm sure it was in her own place of grief - but still ........ you are his baby girl. I hope you are doing okay - navigating the first weeks of grief are hard. Just plain hard. I promise you that you will never stop missing him, even if he was sick for a long time. BUT the memories start to become sweet and tender, without the raw pain - in time. I miss my Mom so much, but I feel it's a tender soft feeling now days. It's like a special longing - but not one that feels like I've been punched in the stomach. More like a whispered kiss on my cheek. Be easy on yourself in these early days. Lot's of self care.
Much love and sympathy to you.