I think that it would be extremely unlikely that any airline would investigate your medical condition beyond your existing possession of a JAA Cat 1 medical certificate. You either meet the Cat 1 standard or you don't.
Where it might become an issue is if you were to take your licence to a different country for conversion to 'their' licence. It's not unusual in these situations for the Licence Issuing Authority (not the airline) to refer to your previous medical history.
Regards,
Old Smokey