Hi
@JasMBird - as the regulars on here will know, I like to get the numbers straight.
You say your HbA1c went from 6 to 12. Was that 6% to 12%? If that is so then you must be with a practice that has not caught up with current best practice which quotes the HbA1c in mmol/mol. 6% and 12% translate to 42 mmol/mol and 108 mmol/mol. 9.2%, your last measurement translates to 76 mmol/mol. If your surgery has not caught up with HbA1c units, you wonder what else they have not caught up with.
The 26 cannot be an HbA1c quoted as a percentage - if it was then it would likely be a world record for somebody still standing! I'm guessing that actually was a blood glucose measurement measured measured either with a finger prick or on a full blood test where a result of 26 mmol/l would cause concern.
Are you measuring your blood glucose levels with a hand held meter? That would help to give some sort of idea about where your blood glucose levels generally are and whether anything you are doing is effecting them.