Only in a place without air, I would feel the panic of claustrophobia, other than that small spaces don't affect me that much.

Only "manageable" if this small space isn't full of objects or people. I didn't know I had a problem until I was in a walk-in closet and about 10 people packed in behind me. I ended up backed into a corner. I remember being on my hands and knees, crawling to the door. It was terrible, not only because of the embarrassment of it but because of the pain in my chest. I ended up having to go outside for air...