I urge both of you to use the palliative care team's service to talk to a support worker for yourselves. That's what they're there for! Yo don't have to do this alone, truly. There are a lot of people who want to help support you emotionally, not just with the practical stuff.
It is mentally and physically exhausting going through what you are. I too found the last couple of weeks in particular excruciating. My father was lucky not to have to live through too much suffering. So I can't imagine what it'd be like waiting longer...knowing someone so close to you is going to die, it's just a matter of when.
It is not healthy to keep your emotions inside of you. I urge you to find a counsellor through palliative care to talk to about all that you are going through. These situations are meant to be shared! So keep sharing what's inside of you, and the load will lighten, even if slightly.
Other things to do are exercise - join some kind of gentle group exercise, or meditation group, or aerobics/dance, or whatever you can do to get movement into your body, and bring some joy back into your life. You are allowed to still enjoy life, all the best xo