Things that help me:
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Having a routine- every Sunday I walk into town and get a nice coffee/cake and read for a while and just be around people. If I stay inside for too long I will start to self isolate.
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Hobby- I go to a couple of choirs during the week. It helps me get out of the house and it's an activity that stops me dwelling on things. You're usually too busy focusing on the music to think of anything else. Singing also helps you regulate your breathing which is supposed to help with relaxation and sleeping.
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Spend time in or around nature, even if that's a pet. Being around green space can help ground you. Being around animals can be a massive boost. Go to the park with a book and spot dogs.
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Medication - this has helped me more than anything but isn't for everyone. I also had a few rounds of therapy but didn't get loads out of it, but it may well work for you.