The writer's great sadness is spoken of as if he was full of a heavy weight. AT: "I am heavy with sorrow" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This is probably figurative. The food that people gave to the writer was so bad that it tasted like poison. AT: "They gave me food that tasted like poison" (See: [[rc://en/ta/man/translate/figs-metaphor]])