Adam Clarke on Lamentations 1:22

Let all their wickedness come before thee - That is, Thou wilt call their crimes also into remembrance; and thou wilt do unto them by siege, sword, famine, and captivity, what thou hast done to me. Though thy judgments, because of thy long-suffering, are slow; yet, because of thy righteousness, they are sure.

For my sighs are many - My desolations continue; and my heart is faint - my political and physical strength almost totally destroyed.

Imprecations in the sacred writings are generally to be understood as declarative of the evils they indicate; or, that such evils will take place. No prophet of God ever wished desolation on those against whom he was directed to prophesy.