Ac causing shortness of breath. Reason?

Hello 27f.whenever I use AC iam feeling shortness of breath,itchy throat nose irritation.this never happened before.from few months iam feeling this way.also I have symptoms-upper back pain (just back of chest)left shoulder blades and left breast pain.when iam laying down the pain is normal but once if I sit or do some work the pain is severe.Having itchy throat occasionally. Tests-vit b12,cbp,crp,lft,lipid,nt pro bnp,thyroid serum creatinine serum uric acid calcium crp all are normal.vit d3 16,esr 28 .for vit d3 used supplements for 3 months weekly one tab.In aug done hrct to rule out covid but no covid but showed bilateral minimal plueral effusion and infective etiology.doctors told its nothing related to it.so what may be the reason ?Plz reply thank you.used many medications for pain for itchy throat antibiotics everything is done .