Welcome to the forum. You have come to the right place for all the little questions - and rants!
DVLA - That is not correct. You only need to tell them if you are taking insulin and even then it took only 6 weeks for me to get a new 3 year license. Presumably you have been given another appt with nurse. Any medication or diet and exercise? First main thing is to reduce carbs ie bread, pastry sweet things - but they are NOT completely out of the question - just reduce.
Others will be on soon to give you all the links to give proper advice