I am very sorry that you, too, feel physical pain.
It's tough to feel alone with your brother's "news." I am very sorry he is ill, by the way. He is now being "bullied" by cancer.

Could you ask your brother if you can at least share with your husband? You husband might then understand more?
Yes, I am very tired and desire to sleep; yet, I cannot sleep uninterrupted at night and cannot relax enough to nap, even briefly during the day.

In time, I will sleep better, I am sure.
It's good to be able to share with you.
I hope symptoms calm down for you.

WC