I don't know why it's come back, but I have GAD and had a severe relapse of it a few years ago...it was hard to deal with. Are you on any meds? I was on an antidepressant for anxiety and it "pooped out". I had to be changed to another. If you're not on meds, well, you may consider it. If you don't feel better soon, I'd be sure to check with a doctor, preferably a psychiatrist. I know it's hard and I feel for you! Taurine really helped me when my anxiety was high!