that's exactly MY story and so many others... we're middle class, super clean people with all almost brand new stuff... how the hell does this happen??
the ONLY explanation i can think of is the amusement park that gave us pinworms, so i got it while we were digging the ground up to put up our pool. That's it.. my thumping is up my butt... like a few inches in. I tried guessing where by looking at a diagram of the digestive system online and it appears to be in my colon area... and it doesn't feel like a small tiny wiggle or a tickle or itch like you'd expect from a pinworm, this feel like something bigger. sometimes it's a flutter and sometimes it's like a small, 20 week fetus. i keep imagining something the size of a small snake. based on how hard the thumping feeling is sometimes. but what's so weird is, it's not in my stomach or even intestines.. it's just right up my butt. i've tried flushing it out with an enema but that doesn't help at all.. just flushes out candida, mucous and junk. sometimes i get this feeling like something creeping up my esophogus to my throat.. ughhh and i'm NOT as crazy as i sound. really lol just frustrated