Steve,
I don't think anyone is going to be able to answer your questions other than the CAA medical division themselves. Whilst there are disqualifying conditions for the various levels of medical certification, the department is very helpful and will be able to guide you in the right direction.
Usually these type of things involve the collation of reports from specialists (yours and theirs,) and an individual assesment is made as it concerns your case.
Whatever answers or opinion you get on here, it is all fairly moot, as your questions need to be directed to the CAA in any event.