I really would recommend staying away from the Centerpointe forum. It's incredibly negative and I have found little benefit from it. Holosync does bring up negative symptoms, but physical brain damage. I think not!
I have gone through periods of mood swings. poor focus and the recurrence of childhood nightmares. But deep inner work does occasionally result in upheaval. If after years of inactivity you started training to run in a marathon, would you not expect some discomfort. I began Matt Fureys Combat Conditioning at the beginning of the year, after the first day I could hardly walk down the stairs;now I feel great.
Use the support line, post here (this is a far more helpful forum). If things seem really bad, take a break, I have done so for several weeks and it helped.
I have read Hutchisons book Megabrain, but he is not an authority. Trust yourselves and your own experience.