Here is a list of simple techniques that may help more immediately.
Arvind's experience with neurofeedback is so interesting and helpful.
I have found that my anxiety is helped most often by getting out in nature, planting my feet on the earth, planting something, feeding the birds and simple mindfulness meditation.
https://tpcfc.org/how-to-deal-with-overthinking-and-anxiety-10-ways-to-calm-your-mind/
Do you have a therapist who can be part of your team at this time when you may need more support?

You are not alone.