Matthew Poole and continuators on Lamentations 1:13

13 From above▪ hath he sent fire into my bones, and it prevaileth against them ; he hath spread a net for my feet , he hath turned me back: he hath made me desolate, and faint all the day.

By Fire he means a judgement as consuming, and as afflictive as Fire in the Bones, which had consumed the strength of the Jews.

That is God had brought them into a condition wherein they were entangled, and could not get out. The Holy man owneth God as the first cause of all the evil they suffered, and entitles God to their various kinds of afflictions; both in Captivity, and during the siege, looking beyond the Babylonians who were the proximate instrumental cause.