Just a minor point following on from Bertie’s comment. You may find yourself not driving in accordance with the law which could open an even bigger can of worms, motoring convictions, fines and an almost impossible task of obtaining car insurance in the future.
Don’t be disheartened, you can go through the DVLA tool I linked to above without telling them who you are and this will tell you if you are legal and OK to drive or if you may need to provide further evidence of your ability.
My first symptoms of MS was Optic Neuritis. My right eye basically stopped working properly and it took almost 12 months to get better. I notified DVLA and with advice from my GP and the eye clinic I was able to legally continue driving throughout. Had I not notified DVLA I would have been committing a number of offences.
Insurance companies will always find a way out of paying if they can and a failure to report something like this or failure to take the correct action will likely void your insurance cover.
Doing the right thing isn’t always the easiest thing but it will always be the right thing.