A/your last resort
Definition 1 of 1
Pro Tip 1/3Desperation Implicit
Implies that the situation is dire and no other options are viable or available. 
When lost in the wilderness without food, signaling for help may become your last resort.
Pro Tip 2/3Negative Connotation
'Last resort' often carries a negative feeling, suggesting reluctance or undesirability. 
Relocating to another city is my last resort for finding a job.
Pro Tip 3/3Serious Situations
Typically used in serious contexts where the stakes are high. 
As a last resort, the government may impose a curfew to ensure safety.