I lost my uncle to the same thing when I was child, my cousins were till young as well. Its a very sudden and sad thing. I hope you will find great comfort in your birds and in time you will feel better.
I am so sorry for your loss. My sister lost her husband in a similar way three months shy of their first anniversary. It is so hard, so unexpected and so unfair. Hope you can find some kind of comfort in these posts. Sending love and prayers your way.