Does excessive secretion of stomach acid cause foreign body sensation in the throat?

This can happen.
Excessive secretion of gastric acid can lead to upward movement of gastric acid, causing gastroesophageal reflux disease, which eventually leads to gastroesophageal reflux pharyngitis with abnormal sensations such as hoarseness, feeling of obstruction in the throat, foreign body sensation, and in a few patients, acid reflux, heartburn, and other manifestations of reflux gastroesophagitis.