Depression and anxiety disorders are different, but people with depression often experience symptoms similar to those of an anxiety disorder, such as nervousness, irritability, and problems sleeping and concentrating.
Each disorder has its own causes and its own emotional and behavioral symptoms.
It is possible to have combinations of both. This may be called a "comorbid" condition when you suffer from both conditions simultaneously, leading people them wonder "which one do I have?". This article explains the differences.
You should always see your doctor to rule out any physical health symptoms. Together you can work out a treatment plan for your mental health. This may include some psychotherapy and/or medication, usually starting with a selective serotonin reuptake inhibitor (SSRI).
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