Anyone has been exposed to mold?

What are the symptoms? I moved 3 months ago to a new apartment.. the first week of moving in we got sick me and kids. A month later we got sick again!! 3 weeks later my 3 kids started recovering and now it seems that their coughs are getting worse, nose congestion and a runny nose. The 2 little ones had low grade fevers and when I took my son to the ER they said he had parainfluenza.. I got antibiotics for him but it doesn’t do anything because As soon as I stopped his runny nose and cough came back. I’m taking them tomorrow to the doctor again to run some tests.. I’m just wondering could it be mold in the house? When I moved in it came with AC,s in all the bedrooms but they were full of mold 😖