Having trouble taking deep breath

What is the treatment of difficulty breathing?
Treatment depends on the cause of this should visit the internal medicine doctor for the necessary tests, but can benefit from the following:
    Take iron, folic acid or vitamin B12 in anemia
    Take isomiprazole pills in case of acid reflux
    lazix pills in the case of water on the lung due to failure of the heart muscle or kidney or liver
    Take Asthma medications such as Ventolin Spray in case of asthma
    Tonselectomy in case of enlargement
    Compressed oxygen in some cases plus other treatment modalities like Covid19 infection
What are the necessary tests in your case?
    Clinical examination
    Chest radiograph
    Blood test
    Check the level of vitamin B12 and folic acid
    Echo image of the heart
    Check kidney function
     PCR
What Causes difficulty breathing?
    Anemia
    asthma
    Lung edema
    heart failure
    Renal failure
    Gastrointestinal disorders
    Enlargement of the tonsils