Hi, I have severe Agoraphobia, which is an anxiety disorder :(
Oh, I'm sorry to hear that. What exactly is that if you don't mind me asking?
It occurs in situations where the person perceives the environment to be unsafe with no easy way to get away. It gives me anxiety when this happens
How is it diagnosed?
Those affected will go to great lengths to avoid these situations, so if someone has these symptoms, they should see a doctor!
Is it considered a disability?
It can be, since it depends on how severe it. Those affected are at higher risk of depression and substance use disorder which can cause disability 
Can you take anything for it?