It sounds like this pain is severe. Stomach pains upon awaking can be have several different causes. What I am worried about most is a stomach or small intestine peptic ulcer. A stomach ulcer will feel like gnawing pain in your mid to upper abdomen that can be quite excruciating. If you do have an ulcer, I would be willing to bet that it is a stomach and not a small intestine ulcer because the stomach ulcers sometimes can be worse in the morning (though not always). However, the pain being in your lower abdomen is a little strange for a stomach ulcer. It is possible that the pain is coming from your colon. Diseases such as inflammatory bowel disease can cause pain in the lower abdomen, but this is usually associated with diarrhea.
I suggest that you schedule an appointment with your primary care physician
. He or she can take a more detailed history of your stomach pain and perform an abdominal exam. Your doctor
may also want to get a test for blood in your stool because ulcers can bleed and you are on coumadin. If there are any positive findings, then you may warrant a referral to a gastroenterologist
for further management and work up. Good luck.