end of one's rope, at the

at the end of (one's) rope

Having reached a point of utter exhaustion or exasperation; in a state at which one has no more patience, endurance, or energy left. The baby's been crying all morning, and I haven't slept properly in days. I'm just at the end of my rope! He's at the end of his rope trying to get this issue resolved.
See also: end, of, rope
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

end of one's rope, at the

Also, at the end of one's tether. At the limits of one's resources, abilities, endurance, or patience. For example, If that loan doesn't come through, we'll be at the end of our rope, or The workmen are driving me crazy; I'm at the end of my tether. This expression alludes to a tied-up animal that can graze only as far as the rope (or tether) permits. [Late 1600s]
See also: end, of
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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