שַׂ֭מְּחֵנוּ כִּימ֣וֹת עִנִּיתָ֑נוּ שְׁ֝נ֗וֹת רָאִ֥ינוּ רָעָֽה׃
Make us glad according to the days wherein Thou hast afflicted us, According to the years wherein we have seen evil.
Read kabbalistic (mystical) interpretation of Psalms 90:15: and classical mystical sources.