Welcome to HCM
See your mother is suffering from Hypertension
, these are lifestyle diseases and needs treatment almost life long.
She should continue to take medicine if there is some stomach upset
she can see the doctor again and even get some other drugs in place of aspirin
or may take ranitidine
like drugs to avoid stomach upset.
she should take care of diet and walking daily 3 to 4 km per day will help in keeping her fit and also to loose some weight.
In elderly it is very common to stop medicine but there are more advantages of taking drugs regularly.
Kindly take her to treating Physician to make her understand importance of every medicine she is advised.
Good luck to her.