Thank you for the query.
removal surgery is kind of risky surgery and some patients will have complications after it. That is why when after such surgery you do present symptoms like hot and cold (possible infection) it should be checked for possible complications appearance.
After esophagus surgery the connection between the stomach and esophagus is located in the chest. Some part of such connections is not tight so the food (mostly liquid) from the esophagus can get into the chest. And if so, the abscess
Other possible complications are pneumonia
, wound infection
, abdominal fluid collection and/or abscess.
That is why I suggest you to visit your doctor, have blood work, CRP level, chest X-ray and abdominal ultrasound
Hope this will help.