Fallen of wagon

Back in mid September I had a check up at the doctors, Hba1c came back 48, went back 2 weeks later for second test to confirm, this test came back 45, diagnosed with prediabetes, over the next few weeks I had to have some other blood tests done but they done Hba1c as well. Two weeks after it was 45 it was 43 and a week after that it was 42, that was early November so in 6 weeks I went from 48 to 42 and lost a good amount of weight. Is this normal? I thought it’s supposed to take months or even years to get it down this much. Since then I have lost another stone and got in my bmi range, so hopefully Hba1c has gone down further I’ve added more carbs and still loosing weight which iam pleased with. I did a glucose test a few weeks ago after a cooked breakfast with a slice of toast and it was 6.2 .Yesterday I met a friend for our Xmas meet up I was worried about eating out and drinking but I though I’ve done really well iam going to not think about it too much, I had some beers and a cocktail and some Japanese food which contained rice and noodles and a few chips thrown in!!! We both shared everything so I probably didn’t eat as much as I thought but now I have a terrible guilt trip like an addict who has fallen off the wagon, have I done something really bad to my hba1c ?
Nurse did say you need to live as well when my journey started, apologies for the long post.
Thanks

Thanks that’s what I was thinking, my old routine was that a few times a week, those days are over, you do actually appreciate it more when it’s one in a while!

Yes eating habits have changed a lot very low carb and intermittent fasting plus more exercise no alcohol until upped carb intake but only small amount on Saturday nights, weight loss is intended also no sugar but have had dark chocolate in small amounts, I have continued to loose weight since upping carb intake but there are days where I still don’t eat any carbs at all and the amount of weight dropped to each week is not as much asin the beginning.
I’ve only tested at home a few times but nurse said just go on hba1c next one Jan 10, hope that’s ok,
Thanks

Thanks very much, actually I should have said that I’ve been going regularly to my g.p to have my blood pressure taken( which was high and now back to normal)and been
updating the nurse on my progress and she always said well done, iam hoping that they would have noticed if anything untoward was happening!
Iam aware of the Newcastle diet and have read up on it but thanks anyway.