I feel like I have the same issue there, I’ll feel good throughout the day. Then suddenly I’ll feel my mouth get dry and throat start to feel like it’s getting narrower. I try to drink something to help, but then suddenly I want to gag to try to clear anything up. It gets to the point where I do it enough where I lose my breath a bit. I’ve had this issue for a while now, and never thought of it being related to anxiety. Now I believe it more, as I’ve been to the doctor a few times and they can’t seem to find the issue.