Hi Kev sorry to read of your situation, thanks for sharing it.
In my professional experience you are "depressed" on the basis
that most people are, it's due to lack of awareness about depression.
Please don't take the above statement as patronising, I'm just stating
a fact. Depression is nothing more than anger turned inward, in other
words if we don't work through our issues, real or imagined to a
positive conclusion it all then becomes fixed into our subconscious and
that leads to the depression, we feel sad, angry, melancholic, but yet
we dont know why, and its this un-awareness that causes the problem.
Start by peeling a few layers of your life back, to when you felt wronged
when you felt angry at something or someone, and ask yourself did ever
really get to the bottom of it, if you didn't that's were the problem is.
In a previous post of mine entitled recommended reading there are
a few books that may be helpful to you.
Hope this helped.
Irwin.