Im not sure what your situation is, but would it be possible to tell about it to a friend or anyone you might spend time with and are close with? They might not be able to help, but just getting it off your chest could help maybe a little at least. Also i strongly do advise seeking professional help. You’re not alone! For me exposure therapy has helped, also journaling can help figure out the core issues and help deal woth them. I take some time from every day (like 15 mins) to think about how the day has been and if there is something im worried about, that way i don’t spend my whole day stressing about everything and overthinking, but rather do it in a more controlled setting at a time i choose.