What Causes Tightness In Lungs With History Of Bronchiolitis And Asthma?

I was born with a lung disease called bronchiolitis, i was clear of that when i turned two years old but developed asthma, I had asthma up until i was 10 years old then I became clear of that too, then at the age of 13 i started smoking but quit at 15 started again when i was roughly 16 1/2 and have carried on smoking, I am now 17 years old and i am currently struggling to breathe properly i feel a tightness within my lungs and there are strong pains in my chest area as well as the fact I ve been Wheezing a lot lately, I have however been using my girlfriends asthma pump which has helped only a small part but im still struggling to breathe clearly, I was hoping there was a diagnostic for these symptoms as i can t get any advice elsewhere for some reason. I am going to have a Spiro test ( lung capacity test ) tomorrow morning at my local G.P s I m just feeling very depressed as i know my results will not be good... Please help me