Ok, several things to do.
You are concerned about your potential to become diabetic.
Simple solution, go to your doctor, and get a glucose tolerance test. It takes several hours (4-6 depending so be prepared) to do, but in the end, will tell you if you are processing sugar like a normal person, or, if you have metabolic syndrome (used to be called "pre-diabetes"). If you do, then the next stop is a diabetes class. Learn about the monster. It's what I have, and it's what I did.
If you do, then you make the changes to push the eventuality of becoming diabetic out as far as you can. This means getting over that sweetners taste yukky (for me, splenda tastes the best now, and sugar actually is bitter!), exercising, and learning about moderation, and how to control the cravings. It's your choice, of course. I weighed losing limbs, eyesight, and shots every day for the rest of my life as a motivator.
If you have metabolic syndrome, I advise getting a simple blood sugar testing kit and doing your own testing. See your waking sugar level and watch the numbers zoom after you ingest sugar, and watch it creep back down when you drink lots of water and process it out of your system.
Next, get some zero nic juice, but in the insanely sweet flavors, like fruit, brownies, apple pie, caramel, waffles, ect to satisfy the sweet monster rather than feeding it the real deal. When you vape, you satisfy the hand to mouth habit, and the sweet taste is what you really want after all, not all the actual sugar and calories you are ingesting. You don't want the nicotine, you are suppressing your appetite, but 4 brownies as opposed to 10 brownies isn't really accomplishing your goal.
I have found with vaping sweet stuff my craving for sweets have gone down. I satisfy the monster that way now. I have also found I lost some weight with that. Yes, I still indulge because I practice moderation, but my moderation levels have gone down too...so that is better for me in the end. 1-2 candy bars a month versus 1-2 per week is really quite nice!
That all said, I have also found that when I quit smoking and started vaping, my waking levels of sugar have gone back down to a normal pattern for a normal non-syndrome person. This is a very good thing!