A tight spot/corner
Definition 1 of 1
Pro Tip 1/3Emotional Impact
Conveys stress or anxiety someone may feel in a difficult situation without showing the outcome. 
Waiting for the test results, I was in a tight spot.
Pro Tip 2/3Metaphorical Use
Used metaphorically rather than literally; no actual small space is involved. 
The debate put him in a tight corner with his opponents.
Pro Tip 3/3Colloquial Language
Common in spoken and informal language, but less likely in formal writing. 
In a tight spot again, eh? Need some help?