Hi, easy to say but don't panic. A bad pneumonia can take months to recover from and to get back to your normal.
If you do have COPD then the right medication (preventive daily inhalers, rapid relief inhalers IE ventolin, a mucylotic IE carbocysteine) can really help to manage it. Extra doses of organic veg, vitamins and minerals to boost your immune system (check with GP).
Most people with it say they manage it and the COPD doesn't manage them.
Keep using this forum, ask many questions, put anything in the search bar top right and lots of recent & older posts will drop down to help you learn. Knowledge is the key.
Psuedanomas (put it in the search bar) can be extremely stubborn, I've read here recently that it is often present in sputum samples even when they're reported clear because of the way the tests are performed so perhaps you still have it.
I'm not suggesting this is correct in your case but sometimes the medics do get it wrong. A CT scan helps for the correct diagnosis. A GP wrote COPD in my medical notes but tests show I don't have it.
Wishing you all the very best - you've found the best forum available to help you. Good luck. Peege
PS do ring that number if you're in the UK, office hours.