Asthma with chest congestion and sinus.

I’m suffering from Asthma and I realised at the age of 15 or 16 . That time I used to take the medicine Asthalin. Later somebody recommended me to go for Asthalin rotohaler. I have a sinus problem also & I find my lungs week since Childhood this thing I realised when I used to run and face breathing problem. Earlier I used to take 1 or 2 caps in a week of Asthalin rotocaps but right now I am taking 6 to 7 Caps in a day. I face congestion problem regularly and every time in night around 4 to 6 o'clock I have to woke up to take the medicine and apart from this I have noticed that in every 4 to 5 hours I have to take a medicine & I do have dust allergy plus I used to smoke till last week and have Around 6 to 7 cigarettes and pass two years. If I have not eaten food for too long or while driving a car continuously for 2hr I face breathing problem. Please suggest which test & doctor I should go for to solve this problem permanently. Is pulmonary function & chest x-ray test good option