Is the phrase "ya waylah" (O woe) or "ya wayltah" (O my woe) considered an act of shirk (associating partners with God)? And what must one do if they utter it and wish to repent?

The saying "Ya wayli" (Woe is me) or "Ya waylatah" (Oh, my woe) is not polytheism (shirk); rather, it is a supplication against oneself for woe or an exclamation. It is a word that expresses torment, sorrow, destruction, and hardship, as if the speaker is calling upon woe to be present. It is also sometimes used to express astonishment.