How sad that you have continuous depressions. I have learned that a depression though is something that goes away, they are not there to stay. If you are always depressed this might be disthymia. Even though this is sometimes considered less sever it can have a serious impact on your life.
I found a link for you:
https://www.hopkinsmedicine.org/health/conditions-and-diseases/dysthymia
Maybe this helps to understand it.

Of course this doesn't make things easier to cope with. I had a few depressions in my life. They were intense and made my life difficult; mostly because I was alone, and lonely.
One had to do with a lack of B12 and the GP at the time was so concerned that he came over for a week, every day, to give me a shot. This really made a big difference and many of the physical symptoms began to go away. The rest followed.