History - oesphoegal cancer (remission) now have persistant wet cough (6 months), severe back pain and recent lump developed on back of head.?

With this history . One should first rule out that there is not any recurrent carcinoma in terms of a spread or metastasis that could be related to either or both symptoms. You need to see the oncologist or your doctor now..
Visit with doctor. In someone who has had a history of esophageal cancer, symptoms like worsening cough, back pain and a new lump should prompt a visit with your doctor or oncologist. Either can perform an exam and other tests to determine what is going on.