Also have chickens and see these threads like a skinny piece of hair but stretchy all over my house too. I do know that it is very difficult for people to get parasites from chickens as birds have a completely different biological makeup. Unlike another mammal. Like goat, dog, cat etc.

Interesting....my symptoms began around the same time I began my chicken flock....

Are you able to see these threads at first glance or do you have to look close under a light? I too am going through the same horror, with my fam thinking I'm insane as well. These thread "worms" or so I call them, are felt everywhere on my body including in my mouth at times. Almost feels like I swallowed a cloud of dust that keeps on trying to come back up. I have seen an occasional whitish worm like piece in my stool and have also had strands of blood in my stool. Which is even more worrisome for me is that I am highly suspecting that my son of 2 1/2 years has caught it too/ or vise versa, maybe I caught it from him initially.
All started to appear about 3 or 4 weeks after a trip to Puerto Rico this past summer
I've been thinking it resembles strongyloids because of these threads somehow making their way into my fingertips/under my nails, almost causing what looks like a case of nail fungus.

Are you able to tell me more about your symptoms? I have terrible fatigue and constipation as well, which confuses me because I've read that most worm parasites would cause diarrhea. I do know that the longer feces resides within the body, the greater the chance is for the body to be afflicted by toxins or in this case possible parasites.