I am derpressed and sad Help !

Have you ever felt depressed? More properly, have you ever 'had' depression? Have you had months-long periods in your life that you can barely remember because they were mostly absorbed by sitting in your bedroom, trying to figure out how to leave and be 'normal' for a moment? I'm not talking about a brief period of intense depression caused by the death of a loved one, of a long-term relationship falling apart, or any other transitory factor: I mean the sort of pathological bleakness that starts in your brainstem and travels down to your soul, to the point where there's brief periods in the day where you know (don't think, know) that suicide is the only answer. Days where the temptation to leave a corpse for others to find and the very act of looking in the mirror is so primally revolting you can barely do it. Days where you sicken yourself just by existing and when sitting in your car you want to start pulling off strips of skin simply because you can't be yourself and exist anymore. It's hard to describe what something like this feels like to someone who's been fortunate enough not to feel it- the very idea that the self no longer makes sense and you spend most of your time in a dream world of total, all-encompassing self-hatred and suffering. Not a romantic sorrow, not something passionate and artistic, but the greyness of living in that mental state, where sadness eventually gets overwhelmed by sheer tiredness, resignation, and regret that you ever existed. There's a potent mixture of insane rage and equally insane self-destruction in the feeling I think only really resonates with people who have been there before (and not even all the time, at that). It's a product of a very peculiar mixture of neurological chemicals and environmental suffering, Not really sad, not crying, not even wishing for another life, but just sitting on the couch, knees pulled to your chest, looking out the window, and not thinking because it hurts too much even to think. The agony that inspires a desperate bid for salvation at the bottom of a pill bottle.