Any advice/experience with neurofeedback?

CJRT

I have spent the last year going through the major portion of my treatment (chemo, Herceptin, surgeries) and will remain on Tamoxifen for 5 years. Though treatment is winding down, I feel residual anxiety that I believe is exacerbating some physical symptoms that may have been brought on by treatment. I was thinking that biofeedback might help me to better manage some of these physical symptoms (hot flashes, rapid heart rate, etc.). I would love to hear about others' experiences with biofeedback for helping with anxiety and physical symptoms. Did you find it helpful?  Is it a gimmick?  Any advice?  It is time-consuming and costly, so I want to make sure that it seems promising.  Your feedback (no pun intended!) is greatly appreciated.