I could feel the air thinning around me, and I couldn't breathe. My vision was littered with dark spots and I could feel sweat dripping down my neck. Everything seemed louder and more intense. At that point, not realising I was having a panic attack, I thought I was going to die.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/what-its-like-to-experience-claustrophobia