There are lots of super mindfulness things online - if you google mindfulness and free you'll get lots back, but here's one to get you started, with several 5-10 minute sequences on it.
www.freemindfulness.org/download
Yoga breathing and mudras might help too.
I also suffer from anxiety, but this kind of thing has really helped me. I've had to do quite a bit of breathing today. I don't go out much anyway, but the fact that I now can't go out even if I want to really got to me earlier.
That and singing. (Badly, usually. I like the songs from the musicals and Irish ballads my mother used to sing when I was little but I always forget the words half way through and end up having to go la la la.)
And as others have said, the STOP technique is excellent. On a course I did recently run by our local mental health Trust they put us into pairs for the 5, 4, 3, 2, 1 exercise and we had to describe them to each other (so, for instance, 5 things you can see, 4 things you can touch, 3 things you can hear, 2 things you can smell, 1 thing you can taste. Though that's not set in stone). It was a brilliant way to ground us in the present.
Also, mindful walking. You can do it in your living room, you don't even need much space for it. (Mindful walking is a different technique from a mindful walking meditation, if that makes sense.)
Or, if you have an Alexa or similar, get her to tell you a story for 10 minutes or listen to a bit of Classic FM.
Also loving the Dancing Queen tip above. I might have to dig out my old Youtube list I put together of "really bad songs to dance to". It's things like the TimeWarp and Gangnam Style and the Macarena and the Hokey Cokey. Or 10 minutes of Mamma Mia or similar?