I have heard that diabetes can indeed be a factor in false test results.
Talk to your doctor, get blood work done and have your A1C checked.
Yes, if you are diabetic or 'borderline' diabetic you can blow false on the breathalizer. Even Carol D or I could blow false as we are both diabetic and I have blown false.
Get to your Dr right away as there may be something else that can do it also. I am sure you will get this dismissed, something is very definitely 'fishy in Denmark' as the old saying goes.
call if you need to vent.
Love and hugs,