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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.
1 doctor agreed: Yes: Anxiety can cause the symptoms you describe. Stimulants like caffeine and nicotine can possibly cause it as well. When you see your doctor, also ask if these could be symptoms of hyperthyroidism. Best of luck! ...Read more.