Thanks for your question on Healthcare Magic.
I can understand your concern.
In my opinion, you should immediately take you're sister to hospital and rule out heart diseases like
heart failure and coronary artery disease (CAD).
She is having old age,
hypertension, on heart medicines and chest pain with chest Heaviness. All these are more suggestive of heart disease rather than anxiety.
So better to
consult doctor and get done ecg, 2d echo,
stress test and coronary
angiography to rule out heart diseases.
She may need additional cardiac drugs.
If all these are normal then no need to worry for heart diseases and then you can think of anxiety as a cause.
So don't wait at home, immediately consult doctor.
Hope I have solved your query. I will be happy to help you further. Wishing good health to your sister. Thanks.