@lifetraveler No one at Mayo suggested but my oncology team supported it. They also do not have any studies on it but this may change. In addition to neurofeedback, I also use a device, prescribed by my therapist, Alpha Stim. Its FDA approved but can only be bought with a prescription. This device helps with my severe anxiety. My team asked I bring the Alpha Stim to my next follow-up in Oct, so they can see how it works and may do study, as an alt to medication.

The neurofeedback does not require a referral, however my therapist recommended it when I exhibited brain fog.

This is my therapist. Our sessions are virtual mostly. I live in NW Indiana, he is in Quincy, IL. I tried the Alpha Stim during a session in-person. Its an amazing experience as the Alpha did not allow my mind to wander. I could focus, which is rare.
https://jerrywalkertherapyservices.com/
This is my neurofeedback team.
https://www.neurobehavior.com/