Hi. Don’t worry.
you need to inform DVLA and your motor insurer.
DVLA will send you a form to fill in to enable you to obtain a restricted licence (Restricted in terms of the time before you need to renew it - usually three years - not what you can drive). This is simply to ensure that you remain fit and healthy whilst driving.
DVLA will check with your doctor on application, but unless you have some serious complications this shouldn’t be a problem.
the only problem I had was that I had to apply for a new photo licence, having an old paper one being under seventy.
the process is straightforward (and free), but it took a couple of months to complete.
i understand that the renewal of a photo licence can be done on line, which is much quicker.
you can continue to drive whilst your licence is being renewed.
best wishes.