No worries. As mentioned, it's best to speak to a professional who can lend you proper techniques and methods on how to cope with these issues and how to feel better and move on.
I've heard depressive episodes can last for years, especially for manic depressives. So again, I'd consider longer bouts of depression like a year a relatively 'normal' human experience, in that I guess many millions of people suffer for this sort of period, too.
I'm kind of lucky in that I've had a sort of in-built cognitive behavioural therapy (CBT), from what little I know about it. For whatever reason, I've learned to arrest overwhelming emotion, recognise it, and think through it rationally. When you recognise the patterns of what causes anxiousness, it is a very assuring thing. But I suspect my main psychological problems are deep-rooted, and come from existential angst, ennui and weltschmerz (mainly this)... Philosophy for me is a spiritual exercise, and I try to live it every day (they used to have 'schools' in ancient Greece which were occupied by this activity), but existence is ultimately just kinda... Saddening! Anyway, I digress and don't want to be a downer 😀
If you struggle to achieve calmness (at least in the present), I've heard meditation can be mighty useful. Also breathing techniques; there are a couple of old traditions from India and China which cover breathing very well, and link to mental well-being. I need to get into meditation/breathing myself, and want to learn some Tai Chi. Unifying and making tranquil your Chi is a lifelong process, and only the few are able to properly master it... Calmness, to me, is one of the supreme states of being... Good luck in the next chapter of your journey 🙏