First, the small black spots on the picture are actually damp mildew spots, just like food mildew, indicating that the house is damp and has a lot of mold, which is not suitable for living for the time being.
Secondly, it is necessary to buy a temperature hygrometer to measure the indoor temperature and humidity, and at the same time take ventilation and dehumidification operations.
Third, empty the room, comprehensively clean the house, clean all or part of the mold, and then repaint it.
Fourth, find out whether there is water leakage or seepage, buy disinfectant such as 84, and thoroughly disinfect the house.
Fifth, go to the hospital to check your body, especially the intestinal flora (stool examination)
After completing the above five points, you can basically solve the problem in the picture perfectly. Hope to adopt