My hunch and we need more research, is that what they call 'overwhelm' is probably what the TM people call 'destressing'.
And both Centerpointe/Holosynch may perhaps be similar:
With the best of intentions, they prescribe exercises that happen to induce CNS disruption in vulnreable people. (Read more about this on www.trancenet.org, the info site for TM)
You can read about all this in relation to TM on [www.trancenet.org
Go there, study their material then see if this resembles Centrepointe
It is intriguing that Bill Harris started out in TM.
THis cries for further research, and a lot of caution for prospective practitioners.
Go here [minet.org
Scroll down and read Kropinksi's 5 part article entitled a visit to the Shankaracharya--detailed discussion of MMY's lack of credentials.
He went to England in 1960, and significantly, did not minister to the emigre Indian community--they wouldve known how to fact check his claims of having a distinguished spiritual pedigree.
If you ever want to read the early history of Maharishi,
Joyce Collin Smith was his secretary for many years. She reported feeling shed been severely injured by TM. Her account of her time with Maharishi begins in Chapter 9 of her book Call No Man Master, available on Amazon.com
When you meet some Indian teacher, you have to make sure they're teaching a valid tradition, not a home-cooked brew with unknown ingredients