It sounds like you are experiencing panic symptoms triggered by claustrophobia. For immediate relief in trigger situations like elevators or metros, a doctor may prescribe short-acting beta-blockers (such as propranolol) to control physical symptoms like sweating and rapid heartbeat, or low-dose benzodiazepines (such as alprazolam) for acute anxiety. For long-term management, daily SSRI antidepressants can help lower overall anxiety. However, medications are most effective when combined with Cognitive Behavioral Therapy (CBT) to address the root fear. Please consult a healthcare professional for a formal diagnosis, as these medications require a prescription and careful supervision.