My pair of two bonded females, Tia and Missy both passed away really suddenly a few months ago and I’m still really affected

Tia passed away from stasis in June time this year. It really really affected me, because she was my baby girl, but I did everything I could to help her so at least that’s a little bit of closure.

However, the same can’t be said about Missy.

Missy was a really, how shall I put it, opinionated, rabbit. She wasn’t afraid to give you a nip or a grunt if she wasn’t happy with you. She was a veggie eating machine and there was no skirting board too hard for her teeth and no corner of the house that could be left unchewed by the wrath of her. She absolutely loved her food. 
The thing that’s really got me stumped is that, the day she died there was no indication of her being unwell. She was eating fine, doing binkies around the house, and just seemed so happy and bright. She just died overnight and I don’t know why.

The idea of her being buried under the ground is really hard on me but I won’t go into detail about it

I just honestly have no clue how she died and it’s really draining.

I’m supposed to be picking up another bunny tomorrow for my current girl Aria, but after Tia and Missy dying within days of each other I’m really paranoid that something will happen.

Like whenever Aria flops to sleep I have a mini panic and make sure she’s alive and sometimes I accidentally wake her up and feel bad.

Can anyone else relate? I just don’t want to miss something