Yes, what Zevin said. That's what I meant by, you can always walk out.
Well, you didn't think you could get an appointment with a gastroenterologist - but you did. You don't think you can find a psychologist, but you will, eventually.
Put all your effort in to it. Call the psychiatric hospital, the salvation army, every charitable organization for mental health in your area. Walk in to the psychiatric hospital and ask for help.
I understand the fear but at least with this all you are going to be required to do is talk, hopefully you can force yourself to get to an appointment.
I understand agoraphobia and I know it is almost impossible to fight alone, however you do manage to get to work which is a really good sign, you aren't completely cut off, so take the opportunity to search out that psychiatric care.
I know you have tried and called, well maybe call them all again, have you tried every charitable organization and psychiatric unit?