Jamieson, Fausset & Brown

As the dried-up brook is to the caravan, so are ye to me, namely, a nothing; ye might as well not be in existence [UMBREIT]. The Margin "like to them," or "to it" (namely, the waters of the brook), is not so good a reading. ye see, and are afraid--Ye are struck aghast at the sight of my misery, and ye lose presence of mind. Job puts this mild construction on their failing to relieve him with affectionate consolation.