Crush and humble your feelings: truly this day has been spent in complete oblivion about God, and in any case, say to yourself:
Do not forget me, Lord, who forgets You!
and sigh about the insufficiency of your faith and love for God. Remember how you spent the day and how you angered God and offended your neighbor... and then repent to God for the whole day, saying the words
Lord, forgive and help!