AGORAPHOBIA

Agoraphobia is a fear of being in situations where escape might be difficult or that help wouldn't be available if things go wrong.

Many people assume agoraphobia is simply a fear of open spaces, but it's actually a more complex condition.

Someone with agoraphobia may be scared of:

travelling on public transport
visiting a shopping centre
leaving home
If someone with agoraphobia finds themselves in a stressful situation, they'll usually experience the symptoms of a panic attack.
See NHS website for more details
NHS Agoraphobia