Adam, I've been depressed as hell for many years (peaks and severe troughs). A few years back I was struggling big time as my Dad was dying of cancer and my horrific relationship was falling apart.
A couple of years on and my outlook has changed based on a number of lifetime changes (see below) and bit of therapy.
(1) I split with my girlfriend at the time as she said I was a selfish p***k spending a weekend with my Dad (who had about 5/6 months left) rather than go to her friend's wedding.
(2) I got well into fitness after kicking Lady Evil to the curb.
(3) Cut down on excessive drinking.
(4) Doctor put me on new medication. Very mild dose but it helps a lot.
(5) My negative pessimistic views have changed to much more positive ideals and I'm much less stressed.
(6) I've recently got a new high powered job working with good people which has given me renewed confidence.
(7) After two years of being single, I've finally met a top lass. It's going great.
(8) More travelling - really does broaden the mind and help independence and social confidence.
Like many people have said here, if anyone needs to chat to me - just holla.