I have had dealings with the Dvla medical section before and it’s a shut in or closed in set of affairs in that department as they are not easy to contact to get information.
At least you were being honest in what you did, if you failed to declare any conditions the fine is £1000.
Another way of looking at it is, if you didn’t declare it, then possibly nothing happens for years and years then someone is killed when you driving a lorry or a car, the ■■■ then hits the fan as you will be looking at prison time depending on the circumstances, but the authorities as in the crown prosecution service, the Traffic Commissioner, your defence barrister, DVSA enforcement and doctors will be all very interested in your medical past history.
The barristers on both the prosecution and defence can obtain all the previous history from the medical records.