Mold?

So unsure if this is allowed or if maybe someone has experienced something similar or maybe direct me in the right direction but my child is in kindergarten and has been sick since the end of October off and on diarrhea, vomiting, sore throat, cough we’ve been to the doctors, emergency room, urgent care and they don’t have much to say other then he is viral stacking which is picking up virus after virus without much time to recover in between. he also had a chest X-ray and it showed bronchitis. He has had NO FEVER this whole time! They gave him an inhaler and cough medicine. But my question is could there be mold in his room making him sick? We let him sleep in our living room last night and he’s definitely in a better mood and hasn’t had horrible coughing fits to the point he pukes. They also said the diarrhea was from his drainage irritating his GI tract? I don’t have much medical background so I don’t know but as a momma I feel like something else is going on. - side note his sister was in the same room before and we were having issues with her itching and kept being told she was having scabies of some sort or an allergy but haven’t had an issue since swapping kids rooms since we welcomed another child.