Brief Answer:
Also consult a good physician.
Detailed Answer:
Hi sir,
Breathing difficulty can be because of many reasons. As it gets worse with physical exertion, it needs to be thoroughly checked. I wouldn't be surprised if there are more than one reasons - its evident that you have sinus issues, but other reasons also need to be unearthed. Your doctor will look for simple cold,
allergy, deviated
nasal septum, nasal mass or poylp, enlarged tonsils, spasm of larynx, vocal cord lesions, chest and lung disorders, cardiac disorders, gastric problem, anemia and
thyroid disturbances.
I insist that your doctors also look into other causes as
sinusitis will not cause breathing difficulty to this extent. I understand you have undergone few tests, but I will order for other routine tests to look into those illness too. Therefore you should also consult a physician too.
You can continue your gastric medications, and take small and frequent meals to reduce
gastritis.
Hope this helps.
Regards