I choked on a good swig of water. Should I be worried about dry drowning?

Probably Not. A google search of "dry drowning" reveals this isolated case in a small child. http://www.cnn.com/2017/06/09/health/texas-toddler-dry-drowning/index.html A normal adult with a normal airway reflex choking on a sip of water is not a significant risk. Sensational media is the greater problem here!