Hello
As you mentioned that when you come in contact with dust, mite , pollen, mold , smoke ,you feel breathlessness ( difficulty in breathing ) .
When someone ( few not all ) come in contact with these items ( mentioned above ) ,person get
allergy ,hence there develop
bronchoconstriction and this causes difficulty in breathing .
As these are predisposing factors causing
bronchial asthma .
As you mentioned that due to cleaning work you feel such type of symptoms i.e allergy i.e. asthmatic allergy .
2nd thing mentioned in the query is that
cold causes chocking of voice as this (sudden increase or decrease in temperature ) is also predisposing factor of bronchial asthma .
These symptoms are due to allergy hence no finding in lungs only pulmonary function test will find out something, so get in PFT .
The best treatment is avoidance of predisposing factors as mentioned earlier .
In my opinion consult a physician or pulmonologist and get his opinion.
Good luck.