Hey Kmw,
I understand your feeling, me also worrying and overthinking for a mistake that I have done. And have anxiety because I cannot fix that immediately if I want to because of COVID-19 situation until now.
You know can't finished immediately what I have to and waiting to finished that is really pain in the neck.
So I really suffer anxiety and keep overthinking in this waiting time. Now over 1 month now. First I was same like you don't know how to get through the day with that anxiety. Everyday is getting worse and can't concentrate on anything.
But now I focus on some other things , like watching movie or playing video games that can change my thought for a while, not completely tho.Sometime you can't concentrate on anything if your anxiety is really high. This make me feel better and kill the times to get through the day.
Staying around your family or roommate friends is also good too. If you are staying alone in your room,get out and stay around someone. Even you don't take with them you know you are not alone. Sometime loneliness make worse our depression. If you don't have anyone around read some article or have conversation with someone online or in this forum. Topic is doesn't matter, movies, weather, country, etc..etc. It make you kill the times.
Hobby or any daily activities is good also. As for me I can't enjoy my hobby since I got this anxiety but I do daily activities/routine like cleaning my room, doing laundry, and cooking breakfast, doing exercise (I will explain about exercise in below). Even I'm not in the mood and don't want to do that kind of thing sometime, I force myself to keep doing those. So my overthinking is distract and make me feel comfortable for a while.
Exercise is really good for your depression. Make you get sweaty and make your lung open, not only good for your depression but also good for your body circulation. I do medium intensity cardio everyday, even I don't want to do sometime I had panic attack. But I force myself to finished cardio and after that I feel really better.
Above things are not completely make me recover from my anxiety or depression,but it give me strength to get through the day until I reach my goal.
Hope I idea can help you and you will feel better soon.
Do you have any hobby or daily routine?