I had a salty old retired general practitioner friend, M.D., whose brother (I also knew) had depression for much of his life. The brother gave some interesting and worth-hearing presentations at my church about how he handled it. The retired M.D. on an entirely different occasion, in private conversation not specifically about his brother, said directly, "Depression can be a life-threatening illness." So you don't panic, but you don't go into denial either. Find a counselor you trust, and be picky; if they're good at first, but you have doubts three appointments in, change counselors. It's worth going to find out how a professional sees your situation. Let someone experienced size it up, and don't try to self-diagnose. Get outdoors; get exercise; watch your diet and water intake; be aware of your own self-care or lack thereof -- sleep, hygiene, social relationships. Get it checked out. If you are okay, continue to monitor yourself. Take it seriously. After a long series of life reverses -- loss of spouse, romantic break-up, major dust-up at work, and more -- I checked in with a counselor who sized me up as coping. When I went to a psychiatrist with my late wife who was undergoing a career crisis, so the doc could hear us relate to each other, as we were leaving, he said, "You've been in analysis, haven't you?" Interesting. I hadn't and told him so. Take good care of yourself. Not just you, but everyone.