Something has happened to my lungs 5 months ago when i had a chest infection and they won't get better. all symptoms point to copd. pft showed asthma.

Lung issues: A respiratory infection can trigger significant lung inflammation and potential damage. This can take time to heal even with medications. COPD would be unusual for a young person unless they had alpha-1 anti-trypsin deficiency. After 5 months of symptoms, it could be helpful to see a lung specialist--sometimes bronchoscopy is necessary to visualize directly into the lungs.

Treatment...: Treatment for asthma includes bronchodilator and steroid inhalers. If symptoms continue, there are other treatments, including evaluation by an allergist to aggressively treat diagnosed allergies. A lung specialist can also assist the family doctor with diagnosis and treatment, so see a lung doctor as well if symptoms persist. If pft is not showing chronic obstruction, COPD is unlikely.