I am just getting fully caught up on this. I apologize for not getting now to the RB sooner. I am so very sorry for your loss. This is just too much. How heartbreaking! You were and will be the an amazing bunny mom. I know pneumonia can work fast and sometimes doesn't have apparent symptoms until it's too late. I haven't had to worry about e.cuniculi in a long while, but I need to read up because though I was aware it could shed through the kidneys and cause some issues there, I didn't know that an enlarged heart and liver were also symptoms. I always attributed that with cancer or heart disease, not with infection or ecuniculi. So the information you have will be helpful for others, and so thank you for sharing even though I know it is so heart breaking to do so.
I know it's almost impossible for you not to blame yourself or think there was someway you could have prevented it. Every single time I have lost a bunny, I felt the same way. I think it's just part of the nature of loss -- it's so painful, that if there was something that we could have done, maybe it could have been stopped. But that's one thing about life, even if you do everything right, things just go wrong and it's not your fault.
So don't go into any mind-loopings thoughts about what could have been, but focus back on the things that were for sure - they felt loved, they had the best care any bunny could ask for, they lived a wonderful life enjoying each other, and you. Give yourself peace with that. I know you have to still go through the mourning part, but don't add blame to it.
And then one day soon, you will be able to open up your heart to another very lucky bunny who will be so fortunate to be loved by you.
Hugs! BinkyFree Comet and Chubs.