Breathing exercises

Sounds like you have serious concerns. A pulmonologist consultation would give you an accurate answer. They will know the best tests to pinpoint your issue and advise you on treatment or reconditioning.
Sorry, but the auto correct from lung to lunch is chuckle worthy. I hope you start feeling better soon.

I just have to say, that was an awesome typo- though I tend to struggle with unlimited lunch capacity 🙂

Re. your question, Debra’s advice is very sound in that it would be important to have some testing done to determine whether you do in fact have some diminished capacity- and why. This will help determine what will help you if you are experiencing that.

The most basic test is spirometry and it measures the amount of air the lungs can hold. The test also measures how forcefully you can empty air from the lungs.

Spirometry is used to screen for diseases that affect lung volumes and those that affect the airways, like COPD and asthma.

Lung volume testing is another commonly performed lung function test. It is more precise than spirometry and measures the volume of air in the lungs, including the air that remains at the end of a normal breath. In addition, a diffusing capacity test measures how easily oxygen enters the bloodstream. Exercise testing helps evaluate causes of shortness of breath. There are also tests to find out if asthma is present when the usual breathing test results are normal.

I would start there and learn more about what you are experiencing and get the information you need to know whether there is a type of medication, therapy, device, etc. that will help you.