This should be higher up

If you’re able to find time to do a 10 day vipassana retreat, I highly recommend it. It’s free and they provide good food, run entirely by volunteers and donations and they have centers all over the world. I’ve done it a couple times and I know several other folks who have and it is a very compelling experience. I really think the technique they teach is a real cognitive skill, it’s taught from a buddhist perspective but there is no requirement that you adhere to any particular spiritual beliefs.

I’m sure there are other forms of meditation that may or may not be helpful, this is just the one I’ve had positive experiences with.

I hope this doesn’t come across as patronizing but have you tried vipassana or a similar style of meditation? My wife had really severe anxiety and she found this to be the thing that helped her the most.