"David is very earnest in prayer...Believers should not rest till they have received some token that their prayers are heard."
Matthew Henry's Bible Commentary
"The use of the expression... "cry" marks the earnestness of the prayers offered. When I lift up my hands,The usual attitude of a Hebrew in prayer (see Exodus 9:29; Exodus 17:11, 12; 1 Kings 8:22, 54; Psalm 63:4; Psalm 141:2; Lamentations 2:19;Lamentations 3:41). Originally, the idea probably was that the hands should be ready to receive the blessings which God would bestow. But, later on, the lifting up of the hands seems to have been regarded as symbolizing the lifting up of the heart"