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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.
But at the same time, if you have anxiety you can also develop chemical imbalances, because anxiety genuinely affects your brain chemicals. The way you think and your emotions is known, without a doubt, to cause problematic releases of serotonin, norepinephrine, etc.ssuming a chemical imbalance is what causes your anxiety and not the other way around, knowing that doesn't change very much about treatment. You still need to: 1  Learn coping tools that can help you overcome your anxiety.