Sounds a lot like acid reflux to me, but GERD and anxiety can be very closely linked. Anxiety can cause GERD, and, in my case, GERD can cause anxiety. It's kind of a vicious circle.
Try talking to your doctor about the symptoms of GERD. Some of them should definitely ring a bell-weird feeling in your throat, for sure. Often, I wake up with a dry/sore throat and think I'm getting sick, but then I remember that I had heartburn the night before and that the sore throat is just GERD. Trapped gas can also cause pain in your back, chest, and abdominal area.
Luckily, GERD can often be treated fairly easily. And once you recognize that that may be the problem, you won't be so worried about anxiety. :)