The fear of complications is overwhelming at the moment.
Don't read about it until you're sure your psyche is ready for it. Complications are something that has been developing for decades, and the phrase "high BG leads to complications" does not mean that if you have high BG during the day, something very bad will happen to you. In the first year you will definitely have no complications (unless, of course, you throw out your insulin), most likely everything will be fine for at least 10 years, and if you control diabetes well, nothing bad will happen to you for the rest of your life.
To be honest, my diabetes started so early that it was never a psychological problem for me, but last winter an event happened in my life after which I didn't know how to live on at all, and that's what helped me:
1) as many routine tasks as possible, such as mopping the floor, cooking, ironing clothes, even if the only thing you want is to lie down and look at the ceiling
2) work tasks, preferably requiring a lot of attention. Something that you can definitely control, because when your attention is focused on something that you can't change, the feeling of helplessness is too strong.
3) meetings with friends, any joint activity that used to bring pleasure
4) as little frightening information from the internet as possible
5) fresh air. Seriously, try just walking and looking at nature, it makes it easier