Your medical is invalid now, as in most countries, you may not exercise the privileges of your licence if you have a medical condition which might affect your ability to hold a medical. The best option is to report this to the medical department of your CAA equivalent and see where it goes from there.
If you continue flying with the condition and have an incident or accident (whether related to the condition or not), you may find yourself in the postion of having no insurance, being sued for damages, and potentially facing criminal action.
Cheers,
BM