Jeremiah told the Jews that God said that he would punish them and they would suffer, so they became angry and were cruel to Jeremiah. Jeremiah suffered when they were cruel to him, and he complained to God about it. However, Jeremiah also praised God for always being with him, trusting that God would punish the people who had harmed him.
These are names of men. This chapter prophesied punishment against Pashhur. He was in charge of protecting the temple and had Jeremiah beaten and arrested.