Why did Hashem do this to me?

h. 1, v. 1: “Vayikroh” – Rashi says that “vayikroh” indicates a calling of endearment. It is most appropriate to point this out here by the laws of sacrifices, because as the verse says, “Odom ki yakriv mi’kem korbon,” a person brings himself as a sacrifice, i.e. the sufferings he goes through are like a sacrificial offering. One might feel that Hashem’s bringing difficulties upon him are because Hashem is displeased with him. Therefore the verse says “vayikroh,” a calling of endearment. Because Hashem loves us He sends difficulties to cleanse us of our sins, “Ki es asher ye’ehav Hashem yochiach.” (Rabbi Klonimus Kalmish of Piesetshna author of Chovas Hatalmidim and Zeiruz Avreichim)

From shemayisrael.com