Hi Craig,
Ask your GP for a blood test, you may have Coeliac Disease, its where the your body cannot tolerate gluten found in wheat, oats, barley and rye. Symptons include unexplained diahhorrea,tummy cramps, wind, bloating, general feeling of unwellness, you can also loose weight. My son was diagnosed feb '07 a year after being diagnosed T1. If a blood test comes back positive they'll do an endoscopy of the gut to confirm it. I hope it's not, but it would be something else to rule out.
Take care.
Suzi x