There have been a few discussions which might be interesting for you to read:
Pill Induced Esophagitis? - General - Living with Eagle
Symptoms for 2 decades, suddenly severe, pending diagnosis - General - Living with Eagle
There’s an old post so you probably wouldn’t get any answers, but there’s mentions of throat spasms by @eddieh here:
My Story - crazy symptoms ..questions - General - Living with Eagle
But it seems that the vagus nerve is involved with oesophageal spasms, and that nerve is commonly involved with ES, so it could be causing yours:
The vagus nerve is the primary nerve involved in esophageal spasms. It plays a crucial role in the regulation of the parasympathetic nervous system, which promotes rest, relaxation, and digestion. The vagus nerve is responsible for transmitting signals between the brain and the body’s major organs, including the esophagus. Disruptions in the vagus nerve’s function can lead to irregular muscle contractions in the esophagus, resulting in spasms. Conditions such as gastroesophageal reflux disease (GERD) and autoimmune disorders can disrupt the vagus nerve’s function, contributing to esophageal spasms.