I'm sorry you're having such a hard time with your symptoms. I don't personally have experience with GAD (I have a specific phobic anxiety disorder), but if the medication isn't doing the job, you should seek help from a psychiatrist specializing in GAD. You may need to up the dosage, or switch meds. Also it always helps to get non-medication treatment as well like cognitive behavioral therapy for example.

Try to hang in there, and definitely search for a psychiatrist in your area