Reassurance unfortunately is not the answer. It is about acceptance of the symptoms as anxiety and nothing more. To understand and accept that these are your body reacting to the anxiety. Once you focus on a specific symptom too much it will amplify and become worse and more consuming. Reassurance may work for one symptom in the short term, but something else will rear it's ugly head and you will be back at the same place. Trying not to fight and letting yourself accept that you are ok will help to lessen the power of the anxiety over you.
This is exactly right. Worrysalot, I hate to be pointing out the obvious, but if, in the last year, you've noticed that this pattern doesn't produce any long-term peace, then why do you keep engaging in the same pattern. Logically speaking, there's something in the cycle that is perpetuating your fears, so continuing the cycle seems ... counterproductive, right?
Crikee is exactly right when she says that it's the acceptance of your symptoms that's key to feeling better. That means telling yourself, when you feel the ache/twinge/palpitation/jerk/what have you, that it's not anything sinister, or at the VERY least, if it is, you'll find out soon enough. That means resisting the urge to ask your friends/family/coworkers/this forum for reassurance, especially since you rarely get the reassurance you feel you want/need. And finally that means not going to the doctor just so they can do tests that will come out the same way all your other tests have come out—which is to say, negatively.
You've identified the pattern—great! Now it's time to break the pattern.