I'm sorry you have this anxiety, how horrible it must feel! If you haven't discussed this fully with your T, that's what I would advise you to do first. Make sure you have a solid understanding of T's promise to continue to treat you, and if at some time T has to end therapy (such as a terminal illness or such) that he tells you how he will share that information with you. You can even have him write it down for you to keep to remind you. If he puts a copy in his file or notes too, that will help you be assured.

Ask your T if he is in this with you for the "long haul." That not only gets the message across to him that you need this assurance, but that you realize it isn't a quick fix and takes time.

Once you've had this talk and assurance, the way to block those fears is to assure yourself of the agreement, and remind yourself of it often, and even tell yourself that T has never left you before and he says he won't, even though others may have.

Hope this helps ease your anxiety.