Agoraphobia is an anxiety disorder that causes people to be afraid of the places or situations that could bring on a panic attack. Their fear of being unable to get help or escape during one of these attacks can make it difficult for them to navigate open spaces, elevators, crowds, concerts, church services, movie theaters, or any place where a panic attack might come on. In extreme cases, a character suffering from agoraphobia may reach the point where they're uncomfortable leaving their home at all.

Frequent panic attacks or elevated anxiety in certain places
Consistently avoiding some locations or situations
Making choices that enable the character to stay at home (working from home, having groceries delivered, etc.)
The character often declining social invitations to specific places (amusements parks, church services, weddings, etc.)
Only venturing outside with a companion
Clinging to the friends or family members who are supportive
Becoming isolated

Wanting to not be limited by the fear but it being too strong to ignore
Knowing the fear is irrational but being being compelled to give in to it
Feeling guilty for making excuses about not being able to attend certain events
The character feeling like they can't trust their own mind or emotions
Feeling defective or broken
Becoming depressed
Slipping into despair—believing that things will never change or get better
Wanting to seek help but feeling too overwhelmed or incapable