It's interesting that recently I saw a number of postings by psychiatrists who were discussing GAD and several of them indicated they rarely saw a patient with it. As they viewed it, it wasn't really a very useful diagnosis. Having said that, I realized that it is the diagnosis you have and I'm wondering what treatments other than the lorazepam you have been offered. I'm not talking about antidepressants used to treat anxiety disorders.
What I find most interesting is that you indicated you had been a successful professional, was financially secure and now not only are you fearful of many things but you have fibromyalgia and many food allergies. Your diagnosis, therefore, would seem to be to be a highly complex one because there may be factors related to your allergies and fibromyalgia which are bringing on this anxiety and fear. I don't know how this has been explored by any healthcare professionals, but I would think it is a worthwhile pursuit.
Please consider your options here because I don't think it is straightforward psychological/psychiatric but may be, as I said, a combination of many things. Someone needs to be the responsible party who will serve as your contact person with any other professionals who may do evaluations.
As it is with everyone, your case requires individualized treatment and I don't believe that there is one simple treatment that will serve to help with everything. In fact, you may be taking medications for other things which can precipitate severe anxiety as a side effect and even your allergies may be causing some of this problem.
I hope this has been somewhat helpful to you and that you do find someone who can begin to work with you on this.