Seamus managed a small smile when Dean felt his forehead. "I'm fine," he said - even though he wasn't at all sure that he was. "Or I will be." It was like having a bad stitch, that didn't go away whether he moved or not. Plus occasional moments of nausea that had convinced him to skip chef's generous offer of square sausage and egg for breakfast.
He didn't need to lean on Dean too much as they headed up the stairs - but he was grateful that the wards accepted them both without Seamus needing to adjust them, because he wasn't certain he could focus enough to perform any magic right now.
"Okay," he said, once they reached the door. "Upstairs: done." He winced, applying pressure that didn't really do anything to stop the pain. He made a pained, unhappy noise in his throat but then pushed the door open.