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Seems like pantium isnt working for her anymore, and regurgitation suggests the presence of something more then GERD
I understand anxiety
regarding any procedure, but sometimes one has to evalute the benefits over ones fears. The symptoms you just described suggest the presence of a pathology relating to the oesophagus. Investigations are NEEDED here.
Yes, if she is experincing severe symptoms and is anxious , then calming her and her symptoms down is a good idea, first. But diagnosis is to be made here.
You can take her to a homoepathic physician for the above mentioned symptoms + her anxiety, for now.