I wish anyone who is grounded every bit of luck in getting back into the air and from what I've heard of Hodgkin's, it's very possible that it's one of the things that can be beaten and is compatible with a return to flying.
As for dealing with the CAA - and I have no allegiance to any organisation - I can only say from my own experience that the medical department do not wilfully turn people down. Quite the opposite - to the extent that they may hold out hope where formerly there was scepticism.
And as advice, I've found that the best aeromedics and medics in general, would caution to treat the person and not the pilot - don't do or not do anything for the sake of attempting to retain a medical category - and if you do decide to do something - do no harm.
Trite, prosaic - obvious possibly - having been there I don't think so. Well worth pondering if it happens to you.