I'd like to try to help you. Please understand that Dr. Vikas gave some good advice regarding the relaxation techniques, but it sounds like you are asking for a bit more support prior to trying to implement them.
The anxiety disorders can feel crippling and overwhelming, and the thoughts that come with GAD are a challenge to combat as they are so powerful. I'm going to give you just one strategy right now, and then wait for your response to it before continuing --so please wait to rate my answer and expect more interaction from me that just this before we are finished.
Anxiety is all about danger --danger that has not yet happened. Sometimes that danger is absolutely real (I.e. if we are walking in front of a bus and need to get out of the way), and sometimes it is perceived (thought about a car accident).
IF we could stay in the "here and now," (the present) anxiety decreases. It's impossible for us to do constantly, and extremely difficult to do for those who suffer from GAD especially.
So, right now, every time a thought comes into your head, say to yourself, "It hasn't happened yet. If it happens, I will deal with it. But right now I am ______ (making lunch, taking out the trash, whatever you are doing) No accident has happened.
This is not a "cure," and will not work perfectly and you will have to do it maybe 100s of times today. But, it's a first step.
I will be back online in about 2 hours, so please write a response and we can continue.