It is better to tell your employer that you are diabetic. You need support from your team, if they don't know -they can't help. Don't put yourself in danger.
Don't panic! You are now part of a dedicated team. We all have lived the path of denial and dread, but - we are here to assist. I welcome you to the forum.
It comes with experience, learning to understand what your body requires. Keep a diary and learn your cycles of up and downs. This will help to take the mystery out of the condition. I truly wish you well on your journey.
Welcome to the forum @Stannewtype1. If you snack, remember count carbs! Try to avoid the sugary sweet treats that surround us every moment of every day. It is not easy, but what can we do.