"MOMMY, I DON'T FEEL GOOD." MANY PARENTS HEAR THAT AND THINK THEIR CHILD IS WHINING. TONIGHT'S HEALTHCAST SHOWS US HOW ONE KID DIAGNOSED HERSELF WITH A SCARY DISEASE BEFORE THE ADULTS NOTICED ANYTHING WRONG. JOSIE SOMERLOTT IS USUALLY BOUNCING AROUND. BUT THE SPRING WAS TAKEN OUT OF HER STEP WHILE WATCHING A MOVIE. "They had a public service announcement that listed the symptoms of diabetes, and I had most of them." WHEN SHE TOLD HER GRANDMOTHER... "I agreed with her. Yeah, you do, but that doesn't mean you have diabetes." JOSIE WENT STRAIGHT TO THE INTERNET AND TOOK AN ONLINE DIABETES QUIZ. "It said, 'If you have one or more then you should go to the hospital immediately.'" HER SCORE WAS SEVEN, SO SHE WENT TO MOM. "I just dismissed it. Oh no, you're fine." THE 11-YEAR-OLD COULDN'T SHAKE THE FEELING SOMETHING WAS WRONG. SHE'D LOST 30 POUNDS BUT WAS EATING AND DRINKING EVERYTHING IN SIGHT. "My wife is a type one diabetic." SO UNCLE KEN BROUGHT JOSIE A GLUCOSE MONITOR. A NORMAL READING IS AROUND 100. JOSIE'S WAS OFF THE CHARTS. "There's a lot of intuitive knowledge from her standpoint to see that and go, 'Wow wait a minute. Could this be something that's going on with me?'" PEDIATRICIAN JAMES SWIFT SAYS THE RED FLAGS FOR DIABETES FAMILIES MISS ARE SUDDEN CHANGES IN A CHILD'S WEIGHT, HUNGER, THIRST AND ENERGY. PARENTS OFTEN OVERLOOK SYMPTOMS OF OTHER DISEASES, TOO. KIDS WHO CAN'T CATCH THEIR BREATH WHEN RUNNING MAY NOT BE OUT OF SHAPE. IT COULD BE A SIGN OF ASTHMA. CONSTANT ABDOMINAL PAIN COULD MEAN YOUR CHILD HAS APPENDICITIS. "She did say, 'I told you so, Mom,' and I think I deserved it. I think I did deserve it." JOSIE NOW MANAGES HER DIABETES WITH INSULIN AND OFFERS THIS ADVICE: IF YOU DON'T FEEL WELL… "Go to the doctor and tell them to check your blood." JOSIE SAYS SHE'S ABLE TO EAT ALL HER FAVORITE FOODS. SHE ALSO CHECKS HER BLOOD SUGAR BEFORE EVERY MEAL AND BEFORE BED.