Your symptoms of stomach pain with alternating constipation and loose motions strongly suggest Irritable Bowel Syndrome (IBS). Because your bowel habits alternate, self-medicating with over-the-counter laxatives or anti-diarrheal drugs can worsen the cycle. I highly recommend consulting a healthcare provider for an accurate diagnosis. For temporary relief of stomach cramps, a doctor may prescribe an antispasmodic like Dicyclomine. Meanwhile, try keeping a food diary to identify triggers, stay hydrated, and manage stress. Please seek immediate medical care if you experience 'red flag' symptoms like blood in your stool, fever, or unexplained weight loss.