Scattering is a pretty classic response to any parasite cleanses of most calibers. Weather DE, herbal or even prescription....Some can cross the brain barrier some can't...some are more effective then others...it's a matter of opinion on what you take and how.
I'm sorry you were caught off guard...having parasites wriggle around your body is NEVER fun, and quite the moral crusher! There are ways to kill them though so be of good cheer! Though it sucks!!