I have now tiny tiny black dots crawling all over our house! Started in all bathrooms on cielings, walls @nigh?

Little tiny tiny black bugs, at night on ceiling and walls in all three bathrooms and now going into other rooms! We have a upstairs/ down stairs and all over, even in ceiler! Bathroms, kitchen near ligtht, Come out at night between 11:00 pm and well dawn most active! Are black not brown from what I know! Special needs, multi handicaped and disabiling child! I just had major life saving surgery and now this! We just found a birds nest was large under our porch and well-a, I threw it away and now e are infested, I believe! I am worried and child is worried! We both have low immune systems both type one diabetic, and can not get sicker then already am with all type one everything! I mom feel nothing diabetic neruopathy, had now 27 years, and well central nervious system is shoot and gone, feel nothing so would not know if bite or crawling anything! What are these things/ Are they harmful to ones health? How to get rid of? Can you get rid of? My child and I are literally crying ourselves to sleep at night, and wearing long everything so do not possibly get bite!!!!!!! HHHHHHHHHeeeeeeeeelllllllllllppppppppppp please! Scared scared for child and me... Child is affraid will get into bedding and well stuffed aniamals and dolls and will need to throw all out and scared beyond belief, does not have much but does want to keep what does have lots of dolls and stuffed aniamals, and wants them saved says her, she is up and crying right now as I typet this, new house two years old and well horrible. Tyring to re coop from surgery and well having big time complications with and now trying to also deal with this help!