The contractions of the body of esophagus are very weak and ineffectual and cannot milk the food down, because there is no normal peristalsis. Structurally esophagus looks ok. Sometimes cancers can mimic these esophageal findings and endoscopy must be carried out to rule out tumor. There is no good medical treatment for achalasia. Generally, pneumatic dilataion is performed by gastroenterologists and this is an outpatient procedure.
Surgeons prefer to do surgery which can be done laprascopically.
Poor health risk patients may be candidates for local injection of bolutinum toxin into the Lower Esophageal Sphincter. Your doc is the best judge.