80% of people go through and episode in their life where they have all the signs and symptoms of a depression.
We all get symptoms of depression every now and then.
The nub is that they all last short periods of time and are selflimiting. Part and parcel of life.
However if these symptoms last longer and don't go away the realitiy is that people suffer from depression.
If you think you may suffer depression the best thing would be to go and see your healthcare professional who will initially have a chat with you ask the appropriate questions, would usually do some blood tests as some physical conditions mimmick depression, and discuss with you the possible diagnoses and where necessary appropriate treatment.
This can be medical or non medical treatment and quite often a combination of both.
Don't short change yourself, go and talk to someone who knows about these things.
FD