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Whatever the answer to your question, snris work on both serotonin and norepinephrine receptors, so if the snri relieved your anxiety it's very unlikely norepinephrine is causing your anxiety -- by taking the snri you just increased the functioning of it and you reduced your anxiety.
That calms the heart rate, the shaking, and other physical symptoms of norepinephrine release, but has very little effect on the emotions and the mood-the really annoying part of anxiety. Beta blockers seem to do a good job on social anxiety, but again, you're still not getting that good an effect on GAD.