i had my hair coloured yesterday inoa was used for the first time i had a terrible reaction i thought i was going to die i ended up in emergrncy were i received an injection in my backside , antihystamine  i believe . I lost my voice for about an hour and was vomiting i felt really bad and could hardly stand up . now i am scared to get my hair coloured at all , i was also covered in welts and could not stop scratching , in other words i had the worse possible reaction ever .