Maybe it isn't an invisible "bug"
A thread like parasite has attacked my home completely as well as caused severe health issues to my children, pets and myself, as well as mental stress and eating disorders due to having to inspect everything to the square mm before it enters my mouth. 1 chair is just the start. After months of torture and ridicule from health officials I have found POSTIA thanks to a family member who actually believed I was not insane loll those health officials will eat their patronizing words now. Never vacuum or swap these things as you will only shift them to other rooms. This is a fungus and not an actual parasite that acts like a parasite so treat it as if treating mould spores for your own sakes. I didn't have this warning but I wish I had. Here are a few images to give u some idea of what to look for and these things seem to be in clothes, carpets, wallpaper yet they love moisture so cover up your body and be careful around fresh water, also any pets water will be avoided for as long as possible by the animal who will also scratch as if they are covered in fleas. White, beige or dark looking fibers that will curl/move when sprayed with water containing a few drops of tea tree oil which is a well known(anti-fungal) aid, try spraying a black t-shirt and seeing if tiny white elastic fibers start appearing and reacting to the spray and then you be sure you have this problem or if you need to carry on searching :)
OK I will have to load images once my photos have a URL, tomorrow hopefully
Maybe it isn't an invisible "bug"
This is very very interesting, as uncountable numbers of questions have been asked about "invisible" bugs biting people. Some folks, like you, are really suffering. Can you get pictures, please?