A 3-year old female child sleeping in a thatched hut woke up in the middle ofthe night screaming. Her mother thought the child had a nightmare and tried to pacify her. After sometime she noticed that the child was sweating profusely and the hands were becoming cold. chUd also vomited a couple oftimes. The mother immediately rushed the child to the emergency services. His pulse was 150/mlnute and his BP 90/60 ram Hg. This child is likely to have -