I don't have claustrophobia, but Emetophobia can bring on claustrophobia, as it can make me become panicky when sitting somewhere outside my safe zone among other people, like in the cinema or on a plane or train. It's because I panic in case I happen to be sick and can't escape and then I'd be causing distress for others and drawing attention to myself with my horrible loud violent retching. Oh my God it can't bear thinking about. It just can't happen, no matter how logical I try and approach the situation. Even for non-Emetophobes, it's still distressing to have someone being sick right near you, especially a stranger. It's gross and embarrassing. It wouldn't be so bad if I was able to just puke discreetly into a bag without anyone knowing, but I know that ain't physically possible for me. It's just the most frightening situation for me to think about and no amount of logic will help. So people saying things like "nobody will laugh at you" doesn't make the thought of the situation any easier. I'm not worrying about people laughing at me. I just don't want the attention drawn to me, even if it's positive and helpful. Just losing control of my body in front of other people in a closed-in space is just really distressing for me to think about. It can't happen. Ever.