My Husband Is Experiencing Acute Stomach Pain; He Has Nausea,

My husband is experiencing acute stomach pain; he has nausea, headaches and vomiting for the past three days. His symptoms are most acute at night but today the symptoms were continuous throughout the day. He has been drinking lots of fluid (water and Gatorade), some toast but otherwise eating very little because he is too nauseous and throws up whatever he takes in. He has been taking prilosec and Tylenol but it doesn't seem to help. Is there anything he should do tonite? He will go to Urgent a are first thing tomorrow, but is suffering lots right now. Thank you! - Sondra