I hope this does not come across wrongly. I think I too would be in denial for quite a while if I developed diabetes. To do so as a cyclist who takes exercise, etc is very annoying and frustrating.
I just wonder if your 9 hours in the car was accompanied by a series of high carbohydrate garage snacks to drive your BG so high.
A very good colleague at work who has developed type 2 (possibly due to statins) told me a couple of days ago that there is now a recommendation for the LCHF diet on the Diabetes UK page. She has seen her BS come down and lost a bit of weight through switching and is really enjoying the diet. would this be worth trying before starting insulin?
Certainly there is evidence that that could help. I assumed no other factors involved than a progression of the condition.
Not enough info in the OP really. Other things to think about
- reduce excess weight if any
- reduce/eliminate high GI carbs
- mix of strength and CV exercise to improve insulin sensitivity
- get used to pre and post meal testing to understand influence of diet on the condition
Don't see use of insulin as bad and an irreversible step, it's just a helping hand whilst you sort out the above, which can then get you back into the right place.
As for denial, that was never an option. If I didn't grab diabetes by the balls nobody was going to do it on my behalf.
One more question to the OP, have you had any structured diabetes education? There are some good courses available depending on where you are.