Unfortunately, what you describe is the result of a very long cultural history of completely misunderstanding mental health. Sometimes it was actually "Big Pharma
The first thing to realize about recovering from depression is that it's a long process, often never really ending. I know someone who has been in therapy for twelve years now, and has made remarkable progress, but still has the "bad days" when her husband has to pull her out of bed to get her up in the morning. I know another person with depression who is usually just fine until something reminds him of his triggering event, that happened almost twenty years ago.
I cheated my way out. I spent six years depressed, because that was a side effect of a medication I was taking. Once I was able to change medications, I was happy again within six months. Popular culture, though, would have you believe this was the normal case. Authors have used depression as a plot gimmick in fiction, and we've historically shunned anyone whose mental health wasn't outwardly perfect. People suffering from depression are told daily (often indirectly) that they should "snap out of it" or "get over it". They're expected to simply forget their sadness and be the perfect normal members of society that they think everyone expects them to be.
Getting help is the first step, but it will not magically fix everything quickly, and that must not be the expectation. Getting help starts the recovery process, but the bad days, the dark feelings, and the perpetual ennui will still be around for quite some time.