Claustrophobia
Claustrophobia is discomfort, anxiety, or severe panic in small, or cramped, spaces.
Useful resources on the web: Click pictures to open in a new tab.
Music ideas if feeling claustrophobic.
It could be natural to close eyes or at least not to focus too hard on , say, all the other passengers on a tube, and listen to music suggesting a much larger natural kind of space. This could include music such as birdsong, waterfalls, rainfall, the sea etc
Natural sounds