KB,
Have you seen this? It explains the symptom/physical sensation=anxiety=more symptoms cycle.
Health Anxiety- The Super Scanner
http://www.get.gg/docs/SuperScanner.pdf
Even if you've seen it before, checking it out again is worth the re-visit
(we have other health anxiety self help in the Resources too...let me know if you're interested, I'll post the links!)
S.C.