It doesn't sound like Diabetis Mellitus, either Type I or Type II.
Type I (It used to be called Juvenile Onset) is the one where your body stops making insulin all together. These are the kids that have to give themselves insulin shots every day since their body (for some reason) decided to destroy the cells that create insulin for their body.
Type II (formerly Adult Onset-it changed because fat kids get it these days) is generally the result of either an insufficient release of insulin or because the body doesn't respond to the insulin as well as it used to. Most folks that are type II are that way because of poor eating habits, are overweight, and sedentary.
Some of the signs of DM (Diabetis) include excessive urination and thirst (someone mentioned this) although that is usually only seen with Type I Diabetics. Type IIs can have this but usually the blood sugar levels on TypeIIs don't get above 250 (normal is 75-110ish). Normally your blood sugar has to get above 300 for it to start overloading the system. What happens then is the kidneys try to strain out the extra sugar. Since Sugar draws water it takes water with it out into the urine (polyuria). You dry out and then are thirsty all the time (polydypsia). It is possible for a Type II diabetic to have these symptoms-I have seen Type IIs with blood sugars over 600 but in general it is rare.
Diabetis is called a silent killer for a reason. Most people won't have a single symptom for years. Meanwhile that excess sugar causes vascular damage that generally effects their eyes, kidneys and heart.
It sounds like it could (I mean could) be a hypoglycemic reaction although you should get more than just feeling some pain in your stomach. Hypoglycemia can result from the body over reacting to a sugar load (like a soda) by kicking out a bunch of insulin. The insulin does it's job (it's job is to transport sugar into the cells). You end up with a bunch of insulin but no sugar eventually. Your body is supposed to regulate this with another hormone called glucagon but sometimes the reaction is delayed.
If you are worried about it talk to your physician. He (or She) can arrange for some tests, ranging from a simple finger stick blood sugar to a 3 or 5 hour glucose tolerence test where they have you drink something with about 8 billion grams of sugar and they check your blood sugar's rise and fall.
Just some blowhard talking here.
