The honesty of Ps42 is a little uncomfortable to hear. It is like reading someone's diary of longing and difficulty. If you want brutal honesty, read Psalm 42.
Things are not going well circumstantially as we step into this psalm. That's where the blues come from. Watch psalmist:
Get honesty before the Lord right
Get the heart longing right
Get the head remembering right
Get the habits heading right,
Then subscribe to this channel. It's a good habit for 7 minutes of your day.
https://youtu.be/BgtkTvSHbww