I have these same things. They have come out of my bowels countless times and they even came out of my muscles during a wet cupping (hijama) session. I feel them twitching in my muscles daily They have essentially rendered me disabled. I am 41 years old and used to be a bit strong guy before this problem.
I believe they are some form of proliferative sparganosis, caused by a fish Tapeworm larvae which multiplies out of control. I used to be a big sushi eater so I believe that’s how I got it. I’ve tried every worm drug and herb and none got rid of them. The only things I’ve tried so far that were somewhat effective were smoking cannabis and drinking large amounts of fresh cabbage juice. I am going to try going on a raw vegan diet without fruit a la Hippocrates/Wigmore in the hopes that it will change my internal chemistry so that they can’t survive.