I had been in the habit of thinking of myself as completely valueless (as I am according to any convention of the world), but having the prayerbook tell me over and over again that although I am in bad shape, I can still dare to approach God in prayer has helped.
Hold on to that brother. Always dare to approach Him. As you are, as a child who needs his Father.
I suffered from depression for about 20 years. I did seek professional help. It started as raging anxiety, which I of course fueled with alcoholism. It was like a wildfire, I was a poster boy for co-dependence. Everything went wrong and felt like a constant explosion of "no hope, no love, no peace, no sleep". Lost my job and some of my most treasured relationships. The last half of it was more "quiet" depression. It was a bit more peaceful and I wouldn't have survived if that wasn't the case, but it was also this constant, heavy blanket weighing me down. In some ways it was better, but also worse. It's hard to tell what happened. I attribute it to God, but it's hard to pinpoint the details. At some point, after being certain that I couldn't take the pain anymore after screaming and crying for who knows how long, I was sure I would have to kill myself. I prayed instead. I don't remember what I prayed word for word, but it was the most sincere prayer I have ever prayed, just a broken man with no hope crying to his God. Some time after that, I had a bit of hope. It wasn't pure hope, just a glimpse of it, I remember the idea was "it doesn't matter if things get better or not. no hurry. no need to react. you won't get worse. hope in Christ". Some strange acceptance started to creep in.
The years from going from one treatment and medicine to another, therapy, many hospital trips, even ECT (I saw one person who did ECT for two weeks, and the change was like night and day, it really worked for her), AA and the works, either started to work even a little bit, or then I was getting to a place where I could allow myself to receive some help, without expecting a miracle or being cynical and defeated about it in advance. If something didn't help, which was often, I could now see leading to something else that might, and I was able to learn more about myself throughout the years. All these things were a crutch in the darkest times, and I have to be thankful, I wouldn't be here without it. I'm glad I took every opportunity to get help, no matter if it helped then or ever, because it was still active hope if not anything else. I still need a crutch, I take minimal amount of benzos every day to deal with my anxiety and to be able to sleep a bit better, but even with that I'm starting to have hope that perhaps one day I could leave them behind as I did with my other meds. But I still believe it was God who turned the wheel, and I became to understand that I could be really loved, and my spirit wouldn't have to be utterly despaired. That no matter how things seem and even feel, I wouldn't have to believe my pressing feelings, even if I have to feel them. I can believe in something better. This has been my struggle in these later years, learning to not succumb to all my feelings, to not believe them, no matter how much they weigh on me. I thank Christ that I can believe in His gracious love instead, whether I feel it or not.
I'm probably still a little depressed, as I am melancholic, have little energy, have some trouble sleeping as I always did and I don't really have goals in life. No companion, no job, on disability pension. But I have more peace now than when I had all those things, when I hadn't even gone properly insane yet. I don't drink anymore, I don't abuse meds anymore. Haven't had a horrible crisis in the last 2-3 years, haven't needed hospitals. And I can keep my apartment a bit more clean now, and force myself to go out some more. I function better, even if not well, and sometimes I can even take pleasure from the most basic, lowly things now. Even being able to be kind to someone reminds me of Christ and feels so important. I remember what my life used to be and I am so much better. There is a foundation now that will not break.
I guess I'm writing this in faint hope that this long pointless ramble might encourage you somehow. If it didn't, think nothing of it, don't let it bring you down. Will pray for you and everyone else who are suffering here. There are so many of us that it saddens me. But we can all encourage each other, and when we are really down, we need the person who is encouraging us to know exactly what it means to be down, to be stuck in that dark pit. You will all be of great comfort to someone, and surely have been in the past as well. You can show God's grace, you can build hope in others. I pray you will all have a lasting, strong hope as well, and you would have all the patience to wait for it if it's still not realized.