Your husband should be seeing a heptologist at a transplant center which is a
liver specialist. GIs are not as thoroughly trained
in liver disease.
It does sound like your husband has decompensated cirrhosis.
He should be on a strict low-no salt diet and not eat red meat.
He does need protein and can get it from eggs, fish, chicken or tofu and beans.
Read all labels. Avoid sodium, which is salt. Stay away from processed foods. When feeding your husband, think fresh and organic.