As someone who has battled this disease for years now, I feel that maybe my saga can shed something to the matter.
For a long time I wasn't aware that I was in fact battling depression. I chalked things up to bad choices, bad timing, a cynical outlook, hanging out with the wrong crowd, dating the wrong people, etc, etc, etc....
Truth of the matter was that I needed help so I finally did go to the doctor and got the diagnosis and was put on medication. That was over 2 years ago give or take, and frankly after 3 months on the pills things got worse. I became in my terms a "zombie" with no real thoughts or feelings on much of anything. Yes on one hand the symptoms of depression subsided but at what cost? That is when I decided to stop the medication and trust my own self to battle this demon on my own. I am in no means advocating this course but it worked for me being that I do not like medicines that mess with my body chemistry.
I have the support of my family in this endeavor and I also take a natural supplement, St. John's Wort, to help wage the fight. The key is to realize that this demon can pop up at all times without warning and to always be vigilant. Train yourself to take a breath and think things out. Ride the emotional roller coaster because every low has a high over the bend. You can take charge of this demon and keep it at bay if you can be strong enough and have the support system in place.
This demon cost me friends, jobs, money, and in one case a great person who I may never get back in my life. But no matter what I keep the faith that things will get better if I stay strong and keep fighting. The stakes are too high to just tuck tail and call it quits. You can battle and come out with victories if you just trust yourself and your doctor's to keep you in each round.
All the best to you and drop me a PM if you wish, I'm happy to assist.