Sherlock Holmes - Nervous attack

My poor friend’s face had suddenly assumed the most dreadful expression. His eyes rolled upward, his features writhed in agony, and with a suppressed groan he dropped on his face upon the ground. Horrified at the suddenness and severity of the attack, we carried him into the kitchen, where he lay back in a large chair and breathed heavily for some minutes. Finally, with a shamefaced apology for his weakness, he rose once more.