It speaks of misery, without providing the specifics. It is a general word that can indicate disaster and adversity of the most diverse nature. This misery was added to the writer by God’s wrath.
Although the verse does not explicitly state whose wrath it is, it is clear from the context that God's wrath is intended. Because this is not explicitly stated, some adhere to the theory that the writer wants to connect this passage to the end of Lamentations 2:1–22, where the wrath of the Lord is mentioned. From this it has been surmised that this song was only composed once a collection of Lamentations already existed and that it was deliberately composed to take its current place. This can however not be the correct explanation, since the same phenomenon occurs in all of the first seventeen verses of Lamentations 3:1–66, while the name of God is mentioned for the first time only in Lamentations 3:18, and then repeatedly thereafter.1
1 I am the man who has seen affliction under the rod of his wrath;