Recurrent cold and cough. Please help.

My son(march 2013 born) is getting recurrent cold and cough since november 2016..usually before that he treated with levolin syrup alone when he was in 2nd year after that once we had to go to nebulisation and after twice he had taken montelukast tablet along with levolin.this is the case when he was having viral only.since birth only twice given antibiotics when fever arises along with cold cough. Now yesterday doc gave him cipla huf puf kit with seroflo and montelukast tab for 2 months and one syrup broxum P. Never tell to give steam but whrnever i give him steam he s relieved. After having 2 puffs of seroflo (salmeterol and fluticasol) developed fast breathing with mouth about after an hour). That breathing was clearly visible it was like he is putting effort to breath.his speech also little disturbed..anyone will come to know something wrong is there..then he slept and and was fine after that.now morning also fine..i have not given any puffs in morning... Please help.