Hi! If your dopey nurse WAS 14 two hours after a sausage and roll, she'd be diabetic or pre-diabetic too. Their lack of knowledge continues to astound me. We can't diagnose you of course, and you didn't ask us to (rightly) but your HbA1c suggests you are pre-diabetic or very close. So you are correct to take action now.
On the assumption that you pay for your strips, you don't want to use more than you need. I suggest therefore that testing 2 hours after eating is key. I wouldn't even bother doing FBGs other than now and again to see how things might be changing. 2 hours after eating, you should be getting BGs below 7.8; hopefully much lower, but If you're above 7.8, you had too many carbs in that meal so cut down then next time. Also check the type of carbs; starchy ones are out. Keep a careful record, so you can refer back. over time you'll get a picture of what you can and can't eat, and in what quantities, so won't need to test so often. Remember also that different people can handle carbs differently at different times! I can have a very carby breakfast, but get worse as the day goes on. Most are the opposite. So also test similar foods at different times.
Finally, remember you need a diet you can stick with for ever or the Demon diabetes will strike! So don't go too extreme if you don't need to. Live by what your meter says.
Good luck.