Thanks for posting your query.
With the available described symptoms, there appears to be possibility generalized anxiety disorder
along with peptic ulcer disease
Presence of burning sensation in throat could be due to acid reflux
Burning sensation in head has no correlation with gastric problem.
You should consult with internal medicine specialist/ psychiatrist
and should go for thorough check up.
Your mother should also take tricyclic antidepressants along with benzodiazepines on written prescription.
She should also take prokinetics or increasing gastrointestinal motility.
Dr. Mayank Bhargava