Hi. Thanks for your query. Noted the history and understood your concerns. Feeling nausea after 20 minutes of having food, feeling that food may come up, discomfort between shoulders all indicate that you may be suffering from GERD with severe esophagitis. The pain in neck and right side of back may be secondary to this problem. Cancer of the esophagus should be ruled out. Hence I would advise you the following in such a situation: Get an upper GI Endoscopy. X-ray of the chest and CT scan is something like cancer is suspected , may be with contrast. Get started on a PPI like Omeprazole. Domperidone as motility regulator. Antacids three hourly. Soft bland diet and plenty of oral fluids. Get an opinion of a Gastroenterologist for final diagnosis and further management. Headache may be non-specific or related to the hypertension, anxiety or stress. Proper management will help you to recover well.