hi. noted history of pain after surgery and hematemesis (vomiting of blood). how long has it been since your operation? are there any other associated signs/symptoms such as nausea, vomiting, jaundice (yellowing of the skin, eyes, oral mucosa)? your hematemesis might be a separate entity and not related to your previous surgery. for confirmation, it is best if you do a follow-up consult with your surgeon or a gastroenterologist, for complete physical examination and clinical evaluation. diagnostics (such as endoscopy, ct-scan, blood examintaions, etc.) and management (medical and/or surgical if indications are found) will be directed accordingly. hope this helps. good day!! ~dr.kaye