Do you have a history of depression? Any family history of depression?
This isn't something that's easily answered. It could be depression, it could be an anxiety issue, it could be a hormonal issue.
The best thing you can do is see your doctor so that physical issues can be ruled out. Then, if your doctor feels it's a mental health issue such as depression or anxiety, you can get a referral to the appropriate doctor for assistance.
Just for your informaton, you might want to try this quiz and see how it comes out for you -- Depression Test: Is it Depression or Something Else?
Hope this helps!
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