Why do I have chest discomfort and breathing issues?

Serflo 125 synchrobreathe is good but you need something more. You may want to try using Budecort respules with your nebulizer. These will help reduce any swelling inside your air passages which should make them wider and easier to breathe through. Do not forget about following the prescribed dosage exactly as instructed. But do visit your doctor before starting the medication.

Difficulty in breathing, production of mucus and chest congestion could be a result of a respiratory infection or an allergy. A pulmonologist should be consulted to diagnose and treat the condition.
 

TB, a common shorthand term for tuberculosis, is a life-threatening disease caused by bacteria that mainly affect the lungs. Humans with TB might experience, amongst others, the following peculiar signs: prolonged cough, chest pain, losing weight, and fatigue. The transmission occurs when a TB patient coughs or sneezes with a built-in airway and thus spreads the bacteria from person to person. 

Seems like you have caught a common cold which is caused by a virus. The symptoms of cough, headache, fever, mucus in the throat and feeling weak can be seen. To feel better try taking more liquid, rest and maybe over the counter drugs for colds. Seek medical advice if you do not improve after one week or if they become severe. 

Asthma is a condition where your lungs tighten, making it difficult to breathe normally. You might feel like you can't take a full breath because your airways narrow. An inhaler, prescribed by your doctor, contains medicine to help open those airways. It's important to keep your inhaler close and use it when your asthma flares up. Properly managing your asthma keeps you safe and healthy.

Dust allergy can be tough to treat.... Montas LC helps..but not always.. Visit an allergist for betterdiagnosis. Try HEPA air filters at HOME.