Welcome to the Forum. I was pre-diabetic, changed my diet to lower carb, went back to normal, then found at the last hba1c that I was back up at 42. Very disappointed. Am battling on with this.
One thing my GP did mention was that I may be more insulin resistant as \I am getting older (I am 65). It may be that your age has something to do with it as our bodies won't work so efficiently when we are older as when we are younger. I was told this by two GPs and a physio.
Anyway I shall battle on as I am not giving in to "age". I am enjoying my food more now that I am watching the carbs. Thankfully, I like cooking and trying different foods. There are lots of lovely recipes in the "recipes" section here.
Thanks for the comments about lower carb can cause higher fasting bloods due to the overnight "liver dump." I was not aware of that before I heard it here.