a feeling of my stomach & lower stomach knotting up

Hello and welcome to e health forum.

Based on the history and the description of the cramps and specifically, in absence of major symptoms ‎like fever, loss of weight, appetite, bloody stools, etc, you may be having Irritable bowel syndrome ‎‎(IBS).‎

Irritable bowel syndrome (IBS) is a chronic functional disorder characterized by cramping abdominal ‎pain or discomfort with alterations in bowel habits (bloating, constipation, and diarrhea). These ‎symptoms usually are present for at least 12 weeks in a patient during the previous one year, and ‎unfortunately the onset or subsidence cannot be predicted. ‎

IBS is diagnosed by its signs and symptoms and by the absence of other diseases. IBS does not cause ‎any permanent damage or any serious illness but the symptoms cause severe discomfort & distress ‎affecting an individuals work, ability to travel and attend social events. ‎

Most symptoms of IBS can be controlled with diet, stress management, and prescribed medications ‎‎(laxatives, antidiarrheals, antispasmodics, or antidepressants). ‎

For symptom relief, you may consider to take antacids for acid relief, activated charcoal for bloating ‎and stomach gas issues.‎

You may consider to consult your physician or a gastroenterologist for counselling and prescription of proper medications as needed.