Hi Donna and welcome!
Look on this diagnosis as a good thing - you are right to think it is a real incentive to change your lifestyle to a more healthy one before it is too late. You are "lucky" it has been caught early and you can get it all under control with a bit of an effort on your part.
Your results have arisen from an HbA1c test, and a score of 50 isn't drastic at all. The cut off point for a diagnosis is 48. I suggest you ask your surgery for a copy of the computer print outs of all your latest tests, HbA1c, kidney and liver functions, and cholesterol. You are entitled to these and will find them very useful for future comparisons.
As for medication, doctors differ, but with such a low HbA1c I would imagine they will allow you a 3 month trial period on diet and exercise, and if I were you, I would ask for this.
Next, I would discard the Eating Well with Diabetes book. I was given one of those and thought "yippee, I can still eat bread and potatoes". Sadly, the NHS hasn't yet caught up with what constitutes a good diet for Type 2's. Have a good browse round these forums to see what types of diets we are all following. The first thing you will notice is we all reduce our carbs, especially bread, potatoes, rice, pasta and cereals as these convert to glucose once inside our system causing our blood sugars to rise. (and that includes the wholemeal varieties). We also need to be careful with fruit and milk as these also contain a lot of sugar.
Next, you need a home testing kit as this is the best tool we have to help us learn which foods our bodies can or can't cope with. Everyone has a different metabolism, and we all tolerate carbs to a greater or lesser degree, which is why you need to know what you can tolerate as none of us can tell you. I doubt very much your doctor/nurse will give you one. More likely they will tell you there is no need to test. That is rubbish. Most of us Type 2's buy our own. If and when you get a meter, let us know and we will help you with testing.
Stick around, ask as many questions as you wish, and good luck!
EDIT post crossed with
@sanguine