WOW!! I read your post with mouth agape!! Why do you think they move towards the centre or the body? Warmth?? More hiding places?
I have felt a few kicks in the stomach area too since yesterday, but I was trying to tell myself they were just muscle twitches. Maybe not! My Gallbladder is often twitching too, I must be a parasite paradise, but not for long!! !
Have you spent much time overseas in third world countries etc, that could have given you extra bad infestations? I have spent months as a kid running around India in barefeet and drinking the water from the tap, also my hubby is African born and raised so I am guessing I have scored a few extra wigglies from him too, though he is very healthy. One kid he knew when he was a kid used to vomit hundreds of big worms periodically!!!!