<prompt>  A young lady complains of sudden onset of palpitations, extreme weakness and sweating. On examination, she was found to have B.P. 9070 with a regular pulse rate of 180minute. Her symptoms disappeared after vomitting but she complained of polyuria. The most likely diagnosis isPrimary thyrotoxicosisAcute anxiety stateParoxysmal atrial tachycardiaParoxysmal atrial flutter 