Alot of those symptoms I can relate to and alot of them have only cropped up since my anxiety shot up a notch a few months back and panic attacks became frequent. Even more interesting is that when my anxiety was at a lower level (last week for example) alot of these symptoms disappeared.
frequent sighing or yawning
pressure in throat or difficulty swallowing
bloating, belching, flatulence, or abdominal pain
These in particular were not present much at all last week but were there every other week including this week where I am strung out again with anxiety.
Really good post, I must look into this more.