It could be depression. Look for a description of depression on the homepage of this website and see if you have any other symptoms.

Only a professional can give you an actual diagnosis, but we can help you decide if it would be a good idea to see a doc. If something is keeping you from working I'd say that's a good reason to find someone.

If you don't know a mental healthcare professional you can ask your doctor or ask at a local hospital or clinic.

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-- http://www.idexter.com