Hello there,
This may sound obvious, but it is really important to clean your
air conditioner. As far as I know , most
air conditioners have a filter type screen that you can remove and clean. Also since you have allergies, make sure that you vacuum your bedroom regularly and dust there too. I have allergies too and an allergy to dust so we make sure to vacuum our bedroom often and dust. Also make sure your mattress has a protector as well.