Hi redsilk
You did not mention what you are doing for you? Are you on meds? Going to therapy?
I am agrophobic (4 years) so I understand what you are feeling. Working my way back is hard, but it can be done.
This course is basically CBT therapy, you might want to see if you can find a doc who does that too and go see them.
I would also suggets "Hope and Help For Your Nerves" by claire Weekes and her other book (she has several) "Simple Effective Treatment of Agrophobia". I use both plus I have some of her tapes too.
Working on you is the #1 priority. Trying to get your mate to understand is hard, unless someone has had a PA they really cant understand the overwhelming, powerful symptoms and the tricks of the mind.
Journaling has also helped me immensly. Putting thoughts into words on paper helps get them out of your mind and can assist in indentifying triggers. Also you can see how negative your thoughts really are and work on making them more positive.
there is a light at the end of the tunnel, sometimes the walk to reach it is long and difficult.