Psalm 55:2 says "I am restless in my complaint and I must moan." Sometimes our heart needs the release of complaint and moaning before God. Verse 6 says "oh that I had wings like a dove I would fly away and be at rest" (think Forrest Gump's Jenny). There are moments in life we wish we could just fly away from, but those are moments we need honest prayer that gets us to verse 16; something lets call an "as for me" moment.
It is good for us to moan complain and sigh in these times, but we must come around to an as for me moment where we call on God knowing he will hear when we cast our burden upon The Lord He will sustain us.