I want to tell you that I understand the emotions you're experiencing. What you have and are doing in caring for those around you is a beautiful and draining experience.
As a long-term survivor, I've cared for many friends as well as my partner, and it can be all-consuming. Do you have a support network around you?
I wrote a few posts I'd like to share with you.
https://h-i-v.net/living/grief-lessons
https://h-i-v.net/living/avoiding-lts-burnout
Many of us here have also lived through this. Let us know how we can support you.