Had dns with sinusitis from past 15 yrs and migraine from past 5 yrs and mild gastric from past 3 yrs i face much problem when i expose to ac i feel like I can't take breath and also i cant say my brain feels like i should come out of it only ac exposure time when i move to normal temp everything will be fine i asked to ent doctor thinking it could be due to sinusitis but he said it might be asthma or some lung related issue i do not have any cough also only breathing difficulty what it could be is it sinusitis only or any other .Chest x ray also done for gastric issue diagnosis  it is normal this difficulty I'm facing from many years what it could be??