J.B.
Although I don't have GAD, I lately have been very anxious about money, to a point where it wakes me up at night. Financial security is a huge trigger point for me and when I feel financially insecure and out of control (which happens a lot when you're a single parent) I will startle myself awake and find myself short of breath and sweating and won't be able to go back to sleep for a while, or will find that anxious thoughts creep into my day. One exercise that I have found helpful is to go through a "so what?" thought sequence. It sort of ends up being like an "If you give a mouse a cookie" book...if my ex doesn't start paying me...so what? I might not be able to pay the baby-sitter this summer...so what? I'll have to ask my parents for money or borrow from my retirement...so what? My retirement account will be lower...so what? I'll need to save more later to make up for it...so what? Maybe I'd need a second job again...so what? And on and on.
At the end of the exercise...I realize that I have options and none of them are horrifying or make the difference between life and death. Inconvenient, stressful, annoying,,,sure. But this isn't an ER and no one is going to die on the table. So it'll be OK. And with that, I can get back to sleep. Maybe something similar will help you to get resolution?