im a computer nerd, so just had to try QXCI machine for biofeedback. People say its quackery and doesn't work, but for what its worth I was very impressed.
I used it more for understanding the body (analysis rather than treatment) and the practitioner was able to tell me stuff about myself I didn't know. For example she told me my issues stemmed from an untreated bout of E-coli 13 years previous... I thought this was rubbish until I got home and though about it, that year I went to Turkey and the whole family got really sick. There were loads of other snippets she told me that made perfect sense and really helped. She suggested changes to diet and stuff which did improve energy level (FWIW the change was to eat avocado, as apparently it thickens the blood and allows it to carry more oxygen etc).
She also zapped me for some know bugs I had, with a warning I might feel tired.. I got home midday and slept the rest of the day lol
I could go on for ages, and the type of biofeedback your talking about is different, but my point is I saw good results with biofeedback so yeah.. I reckon it could help you, especially if recommended by a doc, why wouldn't you?