Can I have a serious gastrointestinal problem or chronic constipation ? I have constant headaches , nausea , constipation and I've lost my appetite , especially in the last 72 hours and I feel bad cause indigestion .

You did not mention your age or if you have other medical problems (diabetes, previous abdominal surgery , current medications, etc. ) , so I will address this question from a general point of view. The most common factors that can cause constipation are : traveling, drinking little water, inadequate fiber intake , medications , dehydration due to fever or sweating, decreased physical activity , thyroid diseases , diabetes and bowel syndrome irritable. Try magnesium glycerin suppositories , enemas and magnesium citrate . Improvement but check with your doctor .