Hello and welcome to e health forum.
The description of your wife's symptoms could be due to motility issues with the esophagus. Eg Esophageal spasm.
Esophageal spasms are abnormal contractions of the muscles in the esophagus (the tube that carries food from the mouth to the stomach). These spasms do not move food effectively to the stomach. Patients present with difficulty or pain with swallowing and Pain in the upper chest or abdomen.
Diagnosis, of such conditions would need studies including a Esophagogastroduodenoscopy (EGD), Manometry and a Barium swallow X ray.
Treatment of such condition can be done with nitrates and low dose anti-depressants.
You may consult with a gastroenterologist, who can examine you and help in proper treatment.
I hope this helps.