SELF-CARE 24/7: FOCUS ON YOU and YOUR HEALTH – this is hard, but not impossible.
We can't recommend this self-focus enough.
It's hard to turn your attention away from the person whom you the love the most, and who hurt you the most, but this is the fastest route out of the pain and the route to empowerment.
You must focus on your own feelings, your own self care, your own safety, your own security, and not look to your partner for instant relief. His illness got you both here, it's not likely he can do anything of real value yet, to help.
Put yourself first. Learn about boundary creation, and enforcement, to create a feeling of safety.