Hi Claire, welcome to the forum. Sorry such a bad experience has led you here. Are you able to inject your insulin at all right now? If not, treat this as an emergency, and go to A and E. Explain what has happened, and that you need immediate access to a new insulin pen. They should be able to write you a prescription, and there is most likely a pharmacy at the hospital too. After that, complain to the highest body possible. If my GP did this then I would consider legal action.