Hi, Thank you for all your advises.
We dont have any carpets in the apartment. Not even a small one. Its all wood. I just bought a Hepa True air purifier and I am not sure what exactly it does as I dont see a difference but I am sure it does clean the air. I vacuum every day and I clean the dust, I will be going soon to the hospital to our doctor for a full examinations so we see what is causing exactly the heavy breathing.