Hmmmm I don't know what it's called but I've had it for over 10 yrs, and it got a lot better after my first cleanse. you hardly notice it now. it sounds alot like what you discribed.
I have been on my cleanse for 2 weeks now and have found many worms ( yucky) and liver flukes too along with the occasional oddball that I don't remember having seen on any sites. I still have 6 more weeks to go, hope I get alot more killed. the movement has stopped though, maybe they are all dead.