Hello, thanks for the query to H.C.M.C.
, burping, uneasiness all are related to constipation
and due to this there is anxiety
Further you don't find any reason of constipation as fiber diet all acts only on limited manner.
Since your father is an operated case of heart surgery so you try two steps as,
tablets at bed time chew or orally , if one is not sufficient than increase the dose accordingly.
If this remedy not acting than try one more home remedy ( Indian).
AMALTAS is a tree and the botanical name is "cassia fistula" . Use the seeds of this tree accordingly.