hi shirley and welcome to HCM,
you are suffering from severe periodontal infection
which is caused by poor oral hygiene
and deposition of bacterial plaque
, calculus and other debris deep in the gum pockets and teeth surfaces.
This has lead to inflammed gums ,recession or apical movement of the gums which exposes the root surfaces of teeth leading to sensitivity and pain.
If not treated in time , infection spreads to the underlying alveolar bone leading to bone loss ,mobility of teeth and finally exfoliation of teeth.
OPG radiograph wll show the exact condition of gums and alveolar bone accordingly periodontal surgery can be planed to improve the health of gums .
As you are a heart patient and on medication for other health issues i suggest you to get a consent or opinion from your physician before going for dental treatment.
i hope this helps,