<--- Type I Diabetic
Upset stomachs do not typically mean you are becoming diabetic, and to my knowledge are not a common symptom. Excessive urination, extreme thirst, and flu like symptoms (always tired and lethargic), are more common.
However, if your diabetic (or hypoglycemic) and your blood sugar gets out of wack, it can make you have slight nausea. Which can be a real problem if your blood sugar is low, and you need to get food in you, or your going to pass out.
banana.... jeez man, your wasting away. You was such a huggely bear befwore *little kid voice*

Sounds like you done trimmed up!