Iraconji jellyfish (pronounced irr-ə-kan-jee) are tiny and extremely venomous jellyfish. Its size is roughly no larger than a cubic centimeter and when a person is stung by an Iraconji jellyfish the experience of Iranconji syndrome is far from a pleasant one. symptoms will consist of extreme pain at various parts of the body , nausea, vomiting, migraines, perspiration, rapid pulse, high blood pressure and even a feeling of impending doom.