Excruciating stomach cramps?

i have been getting these incredibly painful stomach cramps for a couple months now. the only way i can describe them, is that they feel like the cramps that you get when you have diarrhea, except that's not exactly the issue for me. at first when they started i just thought they were the result of me drinking too much soda. so, needless to say i completely stopped drinking that, but the cramps continued nonetheless. this is an every day occurrence for me unfortunately. the pain from the cramps is so excruciating at times, that they literally cause me to vomit. i have been to the doctor and they found nothing wrong, so i was just wondering if anyone else might have some kind of explanation for this or at least know some home remedies? i'm desperate. thank you.