What are Jeremiah's laments in chapter 15?

In the second section of Jeremiah 15, Jeremiah expresses fear for his life, terrified of his angry countrymen. God reminds Jeremiah to listen to God's words rather than let Jeremiah's countrymen influence him.
First (verses 10–14), the prophet laments that, because of the words he is preaching, his fellow countrymen hate him. God answers that He will protect Jeremiah, and then He reveals His plans to exile Israel.
In the next segment (15–21), Jeremiah points out that he has been a faithful prophet, and he questions whether God will save him. "Your help seems as uncertain as a seasonal brook," Jeremiah says, indicating that he never knows exactly when God will come to his rescue.
To Jeremiah, God's help seems like a brook: it comes and it goes. Its presence can't be relied on. Or perhaps, God has abandoned Jeremiah completely, "like a spring that has gone dry."
God reassures Jeremiah that He will protect His spokesman. Jeremiah needs to return to God and to listen to God rather than to people. "You must influence them," God says. "Do not let them influence you!"