Replying to Running problem: stomach cramps really early in my run

alright, so i've been training for a 10k for the past couple weeks or so. started out running 3, increasing by half a mile now i'm running 5. i'm not fast, so don't ask for my mile time. my issue is that even a quarter mile into my run, i'm getting stomach cramps. they're fucking killing me. usually i can run through it, or if i stop for a second they go away, but they're really killing my times. i ate a bag of doritos and drank a bottle of water no earlier than an hour prior to my run. i need to know how to prevent this, it's fucking killing me.