Man I've been feeling the exact same things lately, see my post in the GAD forum. It's got pretty difficult to convince myself that it is anxiety, despite the overwhelming evidence and test results that indicate that anxiety is exactly the problem. Some days I sit here not knowing what to think... should I see yet ANOTHER dr? What if there's something waiting to be found? (Despite the imaging and volumes of bloodwork I've had done, I still doubt... )
The more I think about it, the more I'm convinced anxiety has a unique capability of wearing us down, or waiting us out. It bombards our senses and nerves with a multitude of unique sensations that can imitate the worst ailments. It confuses us, makes us doubt, and tries to reduce our self control. For an invisible disease, it sure packs a helluva punch.