I've been getting those creepy crawlies lately as well. It's funny because that's the exact term that I use for it. I've been having them for about 3 weeks now and I think it's because they're moving to a new home around your lower decending colon or anus to stay away from the herb medicine that kills them. I think there is a less chance they will die from the herbs if they're close to your anus. I've also read that the creepy crawlies are them breeding which really sucks if it's true. In either case you might want to try an enema since they've relocated to that part of the colon. Good luck.