Hi Phoebe,
It's no fun having difficulty with anxiety and I'm sure there's part of you that believes it will never go away. Let me tell you that if I can overcome the anxiety difficulties I had, then anyone can.
Once a person has been anxious for a time, there are automatic thoughts that need to be unlearned and brain circuits that need to be re-routed. There are many cognitive therapy strategies out there that can be learned but typically an anxious person views them as too simplistic or mild to take care of their problem (I sure did) but it works if you keep at it.
In the meantime, it may help you to remember that millions of people down through the last hundred years, have been victims of the JW end times predictions. (note the dates in the photos below) It was all very real to them, just as it was to us. Many, like you and me, were affected badly by the worrisome forecast for the future that was thrust upon us by people we had come to trust. Take comfort in knowing that these predictions were made by people who knew how to play on basic human fears to get what they wanted. It's the oldest trick in the book and their victims (current JW's who are damaged themselves), are (as we once did) unwittingly perpetrating the damage that was started by those early JW Charlatans and snake oil salesman.
The good news is, you are in control of what you think about and your fears are only as real as you let them be. Don't allow them to rob you of your peace of mind. If there is a God, he surely knows what you are going through and if there is to be a life after this one, there's no reason you shouldn't be a part of it as well !