almost 20% of smokers suffer COPD and its comorbidities.
the disease is diagnosed by a simple test called spirometry
and it is graded accordingly.
as per your symptoms you are in stage3/4.
you need combination of inhaled bronchodilators and steroids like formoterol+ budesonide twice daily and inhaled tiotropium 18 microgram daily.
you can add tab theophylline
150 mg twice daily.
if symptoms are too severe a course of oral steroid like prednisolone
40 mg daily for 10-14 days can be taken under omeprazole cover.
if on arterial blood
gas analysis you are in respiratory failure
, better get admitted to ICU/HDU.
consult your family physician regarding the same.
best wishes for your health