Have you asked for a print out of those diagnosis test results like I suggested on your thread yet? It is unlikely you were diagnosed an one fasting blood glucose test alone. We normally have an HbA1c test. Your 8.6 could be either, but as a fasting blood glucose test and an HbA1c are measured in completely different units, it makes a whole world of difference. You need to know!
A fasting blood glucose test is just a snapshot of what your level was at the moment the test was taken and is measured in mmol/l. 8.6 is above the diabetic level.
An HbA1c measures blood glucose over the previous 2 to 3 months on average. 8.6% (or 70.5mmol/mol) equates to 11.1mmol/l and is therefore higher.