GirlFlyday,
Have the CAA categorically grounded you? and have you tried pursuing it further with them?
They have access to specialists and if you ask for a second opinion, they might consider it. Try discussing with them what you would have to do in order to get your Class 2 back. i.e. regularly blood tests or whatever.
I believe that they are reluctant to say "NO" but cautious in saying "YES".
Cheers
Whirlygig
You could also try the medical forum?