If you are on regular medication and have not informed the CAA of that fact you may well find that your Class 1 Medical is void. Quite apart from what ails one, the CAA are very hot on medicines and their side effects. Sometimes this is not a problem at all, simply a change of type of tablet is all that is required.
Your only really sensible option is to follow this advice taken from the CAA medical site.
I have a medical problem which I wish to discuss with a CAA doctor before I take a Class 1 medical examination.
It is best to submit a medical report from either your General Practitioner (GP) or specialist, to the Aeromedical Section for us to evaluate and give you the appropriate advice.
Civil Aviation Authority
Medical Division
Aviation House
Gatwick Airport South
West Sussex RH6 0YR
As you must be aware, some who suffer from bipolar depression can manifest symptoms which one would not really wish to encounter in a cockpit on a dark and stormy night.
If you keep quiet about the business insofar as the CAA and airlines are concerned, they may never find out at all. But if they do, you may well find yourself grounded, jobless and with a reputation in a very small world, so sullied as to be irretrievable.
Advice from the plains of Africa would be to face the demon and get the business sorted out now, one way or the other.
