Hi,Thanks for query,
it seems that you might have some allergy
to as you said Cedar trees where you stay.Allergens produced by trees may give you allergy and some swelling in your throat giving you asthma
You make note that whether this problem is there if you are out of your town for few days.
If you feel better when you are away from your present atmosphere then it is confirmed that you may have allergy to cedar trees.
Another possibility is that due to duodenal ulcer
and acid reflux
you may get this type of sensation.
Ok and bye.