A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown [1882] at sacred-texts.com
A truly grateful love will be evinced by acts of worship, which calling on God expresses (Psa 116:13; Psa 55:16; Psa 86:7; compare Psa 17:6; Psa 31:2).
For similar figures for distress see Psa 18:4-5.
gat hold upon me--Another sense ("found") of the same word follows, as we speak of disease finding us, and of our finding or catching disease.
The relief which he asked is the result not of his merit, but of God's known pity and tenderness, which is acknowledged in assuring himself (his "soul," Psa 11:1; Psa 16:10) of rest and peace. All calamities [Psa 116:8] are represented by death, tears, and falling of the feet (Psa 56:13).
walk before the Lord--act, or live under His favor and guidance (Gen 17:1; Psa 61:7).
land of the living-- (Psa 27:13).
Confidence in God opposed to distrust of men, as not reliable (Psa 68:8-9). He speaks from an experience of the result of his faith.
in my haste--literally, "terror," or "agitation," produced by his affliction (compare Psa 31:22).
These are modes of expressing acts of worship (compare Psa 116:4; Psa 50:14; Jon 2:9).
the cup of salvation--the drink offering which was part of the thank offering (Num 15:3-5).
now--(compare Psa 115:2). "Oh, that (I may do it)" in the presence, &c.
By the plea of being a homeborn servant, he intimates his claim on God's covenant love to His people.
An ampler declaration of his purpose, designating the place, the Lord's house, or earthly residence in Jerusalem.