It's the hardest thing in the world living with someone dealing with heavy clinical depression, imo. It has no visible symptoms, we get really good at hiding it, but it never leaves, even with good medication and therapy. It's like constantly walking through thick mud, like you have weights all over your body, often like living in a haze where your thinking is muddled and even your vision and hearing can be affected. Everything is a monumental effort. You are never who you think you should be. It's stifling. For those who support someone dealing with this I understand the difficulty and you have my utmost respect. I thank God every single day for my wife and that she has stuck with me for 27 years.