Answer:
He feels worthless and dehumanized. He feels like his life is not worth living.
Step-by-step explanation:
He no longer has any way to move about as he did before and he is in pain. He does die.
You could write this from two perspectives:
He is insane and his mind drove him to believe he is a bug.
He honestly had a physical change and therefore he dies since he feels he cannot do anything anymore and he cannot work to take care of his family.