I never experienced feedback for depression. If you decide to use it I hope that it's helpful you in helping in lifting your mood to ease your depression.
This is a form of biofeedback, from what I can tell. Instead of measuring heat or sweat with a biofeedback machine and then using the results to try to get you to learn how to alter these consciously, this technique uses EEG, which is the use of electrodes on your scalp to measure activity in the brain. I can't really see how this could cause side effects. I've had EEG testing for migraines, and it isn't invasive so it's hard to see how it could be the cause of side effects. Maybe some forms are more invasive, as they might use tests such as MRIs which maybe are scary to some folks. According to an NIH article I looked at because I wanted to know more from your question, the problem with it is it's not proven to work and when it does work the effect doesn't last very long. I'm guessing results vary a lot depending on the person, and NIH doesn't like anything that works differently in different people. They like standardization, and those of us with mental illness know there is no such thing. Given how safe an EEG test is, it couldn't hurt, but insurance won't cover it as it's not a proven modality and it is expensive as it uses a device and you'd have to do it several times to see if what you've learned is changing measurements. If you can afford it, doesn't seem to pose a real problem, surely a lot safer than medication, but again, there's no real proof it offers any long-lasting relief. But that doesn't mean it won't help you. Biofeedback has been around a long time, and all forms are based on the same principle, which is, you measure something the body does and then try to learn to purposefully alter that measurement for the better.
Hi. I find neurofeedback so interesting. I don't fully understand it. I've read about brainpaint neurofeedback as the delivery system for it and it gets good reviews. As to studies if it helps with depression? There are many out there. They are looking at it for depression, bipolar, adhd. They say that Neurofeedback can benefit those suffering from bipolar, as neurofeedback helps retrain the brain to have more emotional control, contributing to better, more stable moods, thereby lessening feelings of depression and anxiety. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6823520/ AND https://clinicaltrials.gov/ct2/show/NCT04078438
I guess there are some side effects from it though. This link has a full listing and is an interesting read. https://chicagomindsolutions.com/are-there-any-side-effects-neurofeedback/ Side effects can include anxiety, chattering teeth, cognitive impairment, brain fog, derealization, depersonalization, dizziness, fatigue, headaches. But adverse events are such that people self report and capture anything that happens. To me, some of these sounds like the symptoms of depression that you are being treated for so perhaps it's more of an issue that it doesn't work for that person that creating the side effects, I don't know. That's purely speculation from a lay person.
Are you undergoing neurofeedback? How is it going?