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Your mother has taken domstal
)tab which usually 10mg and used as antiemetic drug as she has taken one tab per day for last 8 days. Her chest discomfort
should not be because of this as it is relatively safe drug but must not be consumed without advise of treating Physician.
As she is diabetic and hypertensive there are many causes which can cause this,Kindly visit the Physician and even get a ECG done to find out any cardiac problems.As Domstal can cause sometimes (QT Prolongation).
A careful examination will find any lung issues and a Xray work up is justified or not.
Keep supply of medicines which are to be used daily with proper label on them or colored container to avoid any such thing happening in future