I took dns with sinusitis surgery 3 months back i had mild gastric (from 3 yrs)and mild asthma (don't know when it started but diagnosed 1yr back)also i feel tightness in my chest some breathing difficulty also when i asked ent dr he said it is gastric is it due to gastric or asthma couldn't understand why it is happening i feel difficulty when i walk it gets worse i can't breathe properly to whom i should consult if it could be due to asthma it occurs only exposed to some triggers only right for me allergic to dust and ac and I'm taking care not to expose to them then y it's happening??