ok, ill assume you passed you test.. its unfortunate you didn't respond back then, so your license will have been revoked, but you still have the 'qualification'
so it should just be a case of completing the forms, and hopefully they will just reissue a 3 year license, however they may decide to perform some for of medical (unusual) so the bad news on that from is it could take upto 3 months
the DVLA medical number is: 0300 790 6806 its normally easier to get through on this even if just to confirm that have had the forms, if not get a new set sent, send it special or recorded delivery just so you know they have actually received it.. a lot of post going missing
i hope you have now accepted your condition, and that you manage to get your life back on track