What Causes Stomach Fullness With Burping?

My 17year old daughter was diagnosed with Achalasia 2 years ago. She s had 2 balloon dilations but is having problems again. At the last dilation, the doctor told us afterwards that it didn t really need doing and thought the problem might be higher up in the gullet. We were told to see how things went. After 5 months she s started complaining of chest pains which she also feels in her throat, headaches, feeling full quite quick (she hasn t eaten a decent meal since being diagnosed, even after the 2 dilations), burping alot, coughing and feeling very tired during the day. I ve tried to make an appointment for a chat about her symptoms with the consultant but he just referred her for another dilation, but I think they should take another look in the gullet. I m worried there s something else going on in there. Any ideas?