So the breathalyzer reading will be lower after eating but only because the actual BAC is lower, not because the device is being fooled
Vitamin B12 is an essential nutrient needed for many body functions, such as making red blood cells, making DNA, and keeping the nervous system healthy
Immediate medical attention is warranted if missed periods are accompanied by concerning symptoms such as severe abdominal pain, heavy bleeding, abnormal vaginal discharge, signs of pregnancy, symptoms of thyroid dysfunction (significant fatigue, cold intolerance, hair loss), or signs of hyperprolactinaemia (galactorrhoea, visual disturbances, headaches)
Also with your dad having Hashimotos you could be more susceptible to thyroid problems