Is it possible for a person to be swallowed by a whale or really big fish? Why should I trust the book of Jonah? Why was Jonah such an awful person throughout the book of Jonah?

Links:

Was Jonah truly swallowed by a whale? - https://www.gotquestions.org/Jonah-whale.html

Questions about Jonah - https://www.gotquestions.org/questions-about-Jonah.html

Did Jonah die while he was in the belly of the fish (Jonah 2)? - https://www.gotquestions.org/did-Jonah-die.html