Under the Weather: feeling ill or sick.
Example: I'm feeling a bit under the weather. I think I'll be getting a cold.
Up a Blind Alley: following a course of action that leads to no good outcome.
Example: The situation just seems to be leading us up/down a blind alley.
Use Your Loaf: to think more carefully about what they are doing, be smart
Example: I do not agree with you about people’s disabilities. Come on, use your loaf!