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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.
Here is what is known about anxiety: 1  Low serotonin levels can be genetic, and may lead to anxiety symptoms. 2  Anxiety can cause lower serotonin levels. 3  Anxiety reduction strategies can increase serotonin.