Difficult one Sarah. As you've obviously had issues with the Class 2 it would appear that your AME is not motivated to help and sadly with the CAA being a law unto themselves to be honest there's not a lot he can do anyway. I would certainly suggest researching a new one and my advice would be to seek one who has been in practise for many years and has experience of such appeals.
It's a while since I went up against the CAA over medical matters but in my career I had to do it twice and I won. However in both cases I used AME's who specialised in appealing such cases and contact details of these were provided by professional organisations such as BALPA or The Honourable Company (Formerly GAPAN) and the IPA. You might also try AOPA UK for the Class 2 situation.
In years gone by the CAA were best approached and asked who they regarded as the primary reference for the particular field of medicine to be reviewed. In one case they nominated an RAF Doctor who I consulted privately. He came down on my side straight away and told the CAA not to be so risk averse. Sadly though that is the bottom line. Whatever the CAA do, both as a Corporation and individually their aversion to taking a decision that has the slightest chance of returning to bite them overrules all else.
Good Luck.