People with severe case of GERD develop complications over time.
Actually, due to repeated and prolonged acid exposure, esophageal lining gets damaged.
During healing, these damages turn into scar tissue that leads to narrowing of esophagus.
When the esophagus narrows significantly, then food and liquids stick in the esophagus and the symptom is known as dysphagia.
I guess you have experienced closed windpipe as a symptom of panic attack (you have probably started panic since you notice difficulties with water passing down the esophagus).
Visit your physician!