Frequent chest tightening. But with pft.

Dear Doctor, I am 39 years old unmarried man. I am very obese 112kg in weight and 5.7 Inch height. From my childhood I have had Asthma problem and have been taking medicines. Currently I have medicine Telekast A 200mg at times prescribed by Pulmonologist, I daily inhale Asthalin rotohaler 4 times because I get 4 Asthma attack in a day, due to fog climate condition at Chennai. On climbing stairs I get Chest tightening. I have other medicines for High BP and  Urticaria problems. I have medicine for High BP Azilday 40 mg 1 and Stamlo 5 mg 1 as advised by Cardiologist for last 1 year. Stamlo 5 mg daily 1  for the past 7 years. Urticaria I have cetzine 10mg daily 1 for the past 7 years. I want to change my medication for asthma. Pulmonologist asked me to get pulmonary function test done so as to give correct dosage of asthma medicine. I did not do PFT due to high cost and my laziness to revisit the Doctor. Now my Asthma attack is increasing hence I need to visit Pulmonologist but with PFT.