Stomach growls every day in cl. I need help!?

Okay, ever since i was near the end of my 6th grade year when i got the flu, my stomach's digestion has made itself known. My friends always stare at how i eat granola bars full of sweets. and like 4 a day. I can barely go an hour without food in my stomach. Sadly, i only eat cereal because I'd eat a better bigger breakfast at school, but in high school I've stopped eating at the school. My problems of my cereal not lasting is one, I have gym first period, so my energy is gone by the end of the period. Then for 2nd, i've got sign language and we don't TALK AT ALL IN THERE, so it's dead quiet in there and not the place for a stomach to growl. Every other cl is fine, but i still have at least 3 granola bars in the morning and one after lunch when my stomach still growls and hurts, though my dad says your stomach cant hurt when your stomach growls unless your dying from hunger. And right after lunch, when my stomach's digestion or whatever is its loudest and when we have test its awful! Also, TAKS test and PSATs are happening on and off and i won't be able to eat ANYTHING without getting notice or thought of "cheating" so i'm trying to tame my stomach. and though 4-6 months is pretty far away it comes faster than you think. I've been taking gas relievers, but i can only take 4 a day and that amount doesn't work with my unusual eating times. Can anyone help? My dad's trying to get me a doctor's appointment, but he has to be there and my mom won't do anything. She doesn't even believe me. Any tips to help me. P.S. in the morning, when i don't feel so hungry and you'd think its a good sign, its not. My stomach is way worse by the time lunch comes and my stomach won't shut up at all for the rest of the day, even after i eat. Which makes dieting to loose my big and to lose those last pounds to get back in the "healthy zone" harder. Can anyone help?