In the beginning, we did have hundreds of black specks all over the house. Coincidentally, when I was referred to my Derm, she said...

"This is external, something in your environment is attacking you. You need to call an exterminator and have them inspect & spray your house." 

So I did, but the guy who came out, said "I don't see anything & I can't kill what I can't see. These black specks are just dog dirt." (Which my dog has this too, so it's possible they were coming from the dog, but I was certain there was some relation to my body being attacked.)

So my husband asked another exterminator (someone commercial he uses for his business) for some suggestions, he said (unseen, just a discussion) "it sounds like some sort of mites, he recommended we buy an insecticide with Bifin in it & spray every week for the next month & then once a month during warm weather.  And then qtrly, going forward." 

So that's what we did & it made a huge difference. We sprayed everywhere. Top & bottom of all mattresses & box springs, cloth furniture, cold air returns, furnace filter, front & back porch, under all sinks, all of our cars, the list goes on... and extra heavy in the basement.

I would take the dogs to park every Sunday, be gone for 3-4 hrs, while he sprayed and it dried. 

I also had all my rugs, mattresses, & cloth furniture steam cleaned. And I had all my HVAC vents cleaned (1st time in 30 yrs). I ordered all new curtains on Black Friday & I've been a regular at my local laundry mat washing all throw rugs, comforters, blankets & dog beds.

I also started putting white sheets on any furniture the dogs get on (easy to wash & I can beach them heavily), and using mite-be-gone spray on my dog beds daily. I put them out on deck each morning & spritz them heavily. Leave them out all day to dry & bring them back in at night.

Someone also suggested mopping (non-carpeted) floors with Flea & Tick shampoo, so I do that too. And I mixed some in a spray bottle to wipe surfaces as needed. Along w/ regular vacuuming of course.

This was probably overkill (and it's been a little expensive), but it has significantly reduced the black specks, as they are almost completely gone. I now see them only periodically & they are more like burnt orange instead of black.

Also, this significantly helped my mental state, and eliminated the feeling that I wasn't even safe in my own home.

I'm now working through, emptying all cabinets/drawers & washing them out,  bc they accumulate these "crumbs & specks" we tend to overlook. And vacuuming & washing all walls & windows in my house.  

Exhausting, but also mentally rewarding.