Thanks for your reply. If you have gone through the link I provided above, some of your symptoms related to food could be explained by this phenomena of rapid gastric emptying, but they are characteristically seen in Zollinger Ellison syndrome, IBS and cases of gastric surgery. Still in my view, you should consult a Gastroenterologist you already haven't for this purpose in order to discuss about it.
Diagnosis of psychiatric disorder such as anxiety disorder is made by exclusion that is once all the medical disease has been excluded. Yes, anxiety can manifest itself in several ways and some of your symptoms could be explained by anxiety disorder also.
For treatment of anxiety disorders, the drug of choice are antidepressants and drugs such as Alprazolam / Lorazepam / Clonazepam all of which belongs to Benzodiazepine category are used for short term basis.
In my view, what you can do it that you take the Alprazolam prescribed by you doctor in recommended doses. To avoid sedation in the morning, take the larger portion of that drug at night and see the results [Please inform your treating doctor and take his permission before doing it ]. If your symptoms are because of anxiety disorder, you will notice an improvement shortly and can further continue the treatment.
In the mean while you also consult a Gastroenterologist for your symptoms.
If you have any other query, please feel free to ask.