Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Lower abdominal cramps, whole body ache indicate a possibility of an intestinal infection. Your detailed history would have helped me to assist you better. From the short history of increase in pain in abdomen on standing and feeling better on laying down indicate severe inflammation of intestines or any other organ in that are. Hence I would advise you the following in such a situation: Consult your Doctor or rush to ER for clinical evaluation, examination and proper investigations of stool, blood and urine. X-ray of abdomen in standing position, Ultrasonography will help further to establish a proper diagnosis which is very important for planning a line of treatment, either medications and/or surgical if there is such a cause. Hope I have answered your query. Let me know if I can assist you further.