'Complaint' in the Bible

When I say, My bed shall comfort me, My couch shall ease my complaint;

If I say, I will forget my complaint, I will put off my'sad countenance, and be of good cheer;

My soul is weary of my life; I will give free course to my complaint; I will speak in the bitterness of my soul.

As for me, is my complaint to man? And why should I not be impatient?

Even to-day is my complaint rebellious: My stroke is heavier than my groaning.