Psalms 102:5 Kabbalah

הוּכָּֽה־כָ֭עֵשֶׂב וַיִּבַ֣שׁ לִבִּ֑י כִּֽי־שָׁ֝כַ֗חְתִּי מֵאֲכֹ֥ל לַחְמִֽי׃

My heart is smitten like grass, and withered; for I forget to eat my bread.

Read kabbalistic (mystical) interpretation of Psalms 102:5: and classical mystical sources.